diff --git a/previous/2015/index.html b/previous/2015/index.html
index f83f6fc..33cb941 100644
--- a/previous/2015/index.html
+++ b/previous/2015/index.html
@@ -527,7 +527,7 @@ <h2>HTTPS Achievements and Challenges</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/CtxPEoZ-6lU?list=PL4sEzdAGvRgAMfxwUK2sAQcq5EdmDV3eW" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/CtxPEoZ-6lU?list=PL4sEzdAGvRgAMfxwUK2sAQcq5EdmDV3eW">YouTube</a></li>
-                                <li>Slides: <a href="http://www.webengineshackfest.org/slides/https-achievements-and-challenges-by-michael-catanzaro.pdf">PDF</a></li>
+                                <li>Slides: <a href="http://www.webengineshackfest.org/2015/slides/https-achievements-and-challenges-by-michael-catanzaro.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Monday 7th December 2015</li>
@@ -558,7 +558,7 @@ <h2>Going upstream: the future (or lack thereof) of WebKit Clutter</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/zn-FWJF8A5Y?list=PL4sEzdAGvRgAMfxwUK2sAQcq5EdmDV3eW" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/zn-FWJF8A5Y?list=PL4sEzdAGvRgAMfxwUK2sAQcq5EdmDV3eW">YouTube</a></li>
-                                <li>Slides: <a href="http://www.webengineshackfest.org/slides/going-upstream-the-future-or-lack-thereof-of-webkit-clutter-by-gustavo-noronha.pdf">PDF</a></li>
+                                <li>Slides: <a href="http://www.webengineshackfest.org/2015/slides/going-upstream-the-future-or-lack-thereof-of-webkit-clutter-by-gustavo-noronha.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Tuesday 8th December 2015</li>
@@ -589,7 +589,7 @@ <h2>Recent Blink improvements in Text &amp; Layout</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/Plhnr7mPhxw?list=PL4sEzdAGvRgAMfxwUK2sAQcq5EdmDV3eW" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/Plhnr7mPhxw?list=PL4sEzdAGvRgAMfxwUK2sAQcq5EdmDV3eW">YouTube</a></li>
-                                <li>Slides: <a href="http://www.webengineshackfest.org/slides/recent-blink-improvements-in-text-and-layout-by-dominik-rottsches.pdf">PDF</a></li>
+                                <li>Slides: <a href="http://www.webengineshackfest.org/2015/slides/recent-blink-improvements-in-text-and-layout-by-dominik-rottsches.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Tuesday 8th December 2015</li>
@@ -620,7 +620,7 @@ <h2>Streams API and you</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/O94an4pZfb4?list=PL4sEzdAGvRgAMfxwUK2sAQcq5EdmDV3eW" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/O94an4pZfb4?list=PL4sEzdAGvRgAMfxwUK2sAQcq5EdmDV3eW">YouTube</a></li>
-                                <li>Slides: <a href="http://www.webengineshackfest.org/slides/streams-api-and-you-by-xabier-rodriguez-calvar-and-youenn-fablet.pdf">PDF</a></li>
+                                <li>Slides: <a href="http://www.webengineshackfest.org/2015/slides/streams-api-and-you-by-xabier-rodriguez-calvar-and-youenn-fablet.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Wednesday 9th December 2015</li>
@@ -651,7 +651,7 @@ <h2>MathML in Web Engines</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/1KfmYqKN9Tg?list=PL4sEzdAGvRgAMfxwUK2sAQcq5EdmDV3eW" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/1KfmYqKN9Tg?list=PL4sEzdAGvRgAMfxwUK2sAQcq5EdmDV3eW">YouTube</a></li>
-                                <li>Slides: <a href="http://www.webengineshackfest.org/slides/mathml-in-web-engines-by-frederic-wang/mathml/">HTML</a></li>
+                                <li>Slides: <a href="http://www.webengineshackfest.org/2015/slides/mathml-in-web-engines-by-frederic-wang/mathml/">HTML</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Wednesday 9th December 2015</li>
diff --git a/previous/2016/index.html b/previous/2016/index.html
index 507fac8..3dd64d9 100644
--- a/previous/2016/index.html
+++ b/previous/2016/index.html
@@ -558,7 +558,7 @@ <h2>Servo: Today & Tomorrow</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/UGl9VVIOo3E?list=PL4sEzdAGvRgCYXot-o5cVKOobIXZI5iLF" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/UGl9VVIOo3E?list=PL4sEzdAGvRgCYXot-o5cVKOobIXZI5iLF">YouTube</a></li>
-                                <li>Slides: <a href="http://www.webengineshackfest.org/slides/servo-today-and-tomorrow-by-jack-moffitt.pdf">PDF</a></li>
+                                <li>Slides: <a href="http://www.webengineshackfest.org/2016/slides/servo-today-and-tomorrow-by-jack-moffitt.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Monday 26th September 2016</li>
@@ -590,7 +590,7 @@ <h2>Ten Years of HarfBuzz</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/T79LMEXkf9w?list=PL4sEzdAGvRgCYXot-o5cVKOobIXZI5iLF" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/T79LMEXkf9w?list=PL4sEzdAGvRgCYXot-o5cVKOobIXZI5iLF">YouTube</a></li>
-                                <li>Slides: <a href="http://www.webengineshackfest.org/slides/ten-years-of-harfbuzz-by-behdad-esfahbod.pdf">PDF</a></li>
+                                <li>Slides: <a href="http://www.webengineshackfest.org/2016/slides/ten-years-of-harfbuzz-by-behdad-esfahbod.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Tuesday 27th September 2016</li>
@@ -622,7 +622,7 @@ <h2>Fetching Bytes and Words on the Web</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/hJoxO4_fwWY?list=PL4sEzdAGvRgCYXot-o5cVKOobIXZI5iLF" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/hJoxO4_fwWY?list=PL4sEzdAGvRgCYXot-o5cVKOobIXZI5iLF">YouTube</a></li>
-                                <li>Slides: <a href="http://www.webengineshackfest.org/slides/fetching-bytes-and-words-on-the-web-by-youenn-fablet/">HTML</a></li>
+                                <li>Slides: <a href="http://www.webengineshackfest.org/2016/slides/fetching-bytes-and-words-on-the-web-by-youenn-fablet/">HTML</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Tuesday 27th September 2016</li>
@@ -654,7 +654,7 @@ <h2>From "WebKit for Wayland" to WPE</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/LI8jQEcFsbk?list=PL4sEzdAGvRgCYXot-o5cVKOobIXZI5iLF" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/LI8jQEcFsbk?list=PL4sEzdAGvRgCYXot-o5cVKOobIXZI5iLF">YouTube</a></li>
-                                <li>Slides: <a href="http://www.webengineshackfest.org/slides/from-webkit-for-wayland-to-wpe-zan-dobersek.pdf">PDF</a></li>
+                                <li>Slides: <a href="http://www.webengineshackfest.org/2016/slides/from-webkit-for-wayland-to-wpe-zan-dobersek.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Wednesday 28th September 2016</li>
@@ -685,7 +685,7 @@ <h2>Cluttering WebKitGTK+</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/PKVFwxbtAOk?list=PL4sEzdAGvRgCYXot-o5cVKOobIXZI5iLF" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/PKVFwxbtAOk?list=PL4sEzdAGvRgCYXot-o5cVKOobIXZI5iLF">YouTube</a></li>
-                                <li>Slides: <a href="http://www.webengineshackfest.org/slides/cluttering-webkitgtk-by-gustavo-noronha.pdf">PDF</a></li>
+                                <li>Slides: <a href="http://www.webengineshackfest.org/2016/slides/cluttering-webkitgtk-by-gustavo-noronha.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Wednesday 28th September 2016</li>
diff --git a/previous/2017/index.html b/previous/2017/index.html
index aac74fc..e226712 100644
--- a/previous/2017/index.html
+++ b/previous/2017/index.html
@@ -594,7 +594,7 @@ <h2>Improving interop with web-platform-tests</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/mlLycN8LqD8?list=PL4sEzdAGvRgDWjpudPPN38xjUpbXfOiW4" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/mlLycN8LqD8?list=PL4sEzdAGvRgDWjpudPPN38xjUpbXfOiW4">YouTube</a></li>
-                                <li>Slides: <a href="slides/improving-interop-with-web-platform-tests-by-philip-jagenstedt.pdf">PDF</a></li>
+                                <li>Slides: <a href="2017/slides/improving-interop-with-web-platform-tests-by-philip-jagenstedt.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Monday 2nd October 2017</li>
@@ -625,7 +625,7 @@ <h2>Optimizing zlib for ARM</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/lGo7nOx4A24?list=PL4sEzdAGvRgDWjpudPPN38xjUpbXfOiW4" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/lGo7nOx4A24?list=PL4sEzdAGvRgDWjpudPPN38xjUpbXfOiW4">YouTube</a></li>
-                                <li>Slides: <a href="slides/optimizing-zlib-for-arm-by-adenilson-cavalcanti.pdf">PDF</a></li>
+                                <li>Slides: <a href="2017/slides/optimizing-zlib-for-arm-by-adenilson-cavalcanti.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Monday 2nd October 2017</li>
@@ -656,7 +656,7 @@ <h2>The Chromium/Wayland project</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/efmYPFHnaSM?list=PL4sEzdAGvRgDWjpudPPN38xjUpbXfOiW4" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/efmYPFHnaSM?list=PL4sEzdAGvRgDWjpudPPN38xjUpbXfOiW4">YouTube</a></li>
-                                <li>Slides: <a href="slides/the-chromium-wayland-project-by-antonio-gomes-and-maksim-sisov.pdf">PDF</a></li>
+                                <li>Slides: <a href="2017/slides/the-chromium-wayland-project-by-antonio-gomes-and-maksim-sisov.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Tuesday 3rd October 2017</li>
@@ -687,7 +687,7 @@ <h2>BigInt: Integers as big as you want in JavaScript</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/58qyMBl9e28?list=PL4sEzdAGvRgDWjpudPPN38xjUpbXfOiW4" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/58qyMBl9e28?list=PL4sEzdAGvRgDWjpudPPN38xjUpbXfOiW4">YouTube</a></li>
-                                <li>Slides: <a href="https://webengineshackfest.org/slides/bigint-integers-as-big-as-you-want-in-javascript-by-daniel-ehrenberg.pdf">PDF</a></li>
+                                <li>Slides: <a href="https://webengineshackfest.org/2017/slides/bigint-integers-as-big-as-you-want-in-javascript-by-daniel-ehrenberg.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Tuesday 3rd October 2017</li>
@@ -718,7 +718,7 @@ <h2>WebRTC(s) in WebKit(s)!</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/8AbO9NrLtbQ?list=PL4sEzdAGvRgDWjpudPPN38xjUpbXfOiW4" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/8AbO9NrLtbQ?list=PL4sEzdAGvRgDWjpudPPN38xjUpbXfOiW4">YouTube</a></li>
-                                <li>Slides: <a href="https://webengineshackfest.org/slides/webrtcs-in-webkits-by-alex-garcia-castro-and-youenn-fablet.pdf">PDF</a></li>
+                                <li>Slides: <a href="https://webengineshackfest.org/2017/slides/webrtcs-in-webkits-by-alex-garcia-castro-and-youenn-fablet.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Wednesday 4th October 2017</li>
@@ -749,7 +749,7 @@ <h2>Challenges of the VR Web</h2>
                             <iframe width="640" height="360" src="https://www.youtube.com/embed/HSDKBS1BR1k?list=PL4sEzdAGvRgDWjpudPPN38xjUpbXfOiW4" frameborder="0" allowfullscreen></iframe>
                             <ul class="list-inline">
                                 <li>Video: <a href="https://youtu.be/HSDKBS1BR1k?list=PL4sEzdAGvRgDWjpudPPN38xjUpbXfOiW4">YouTube</a></li>
-                                <li>Slides: <a href="https://webengineshackfest.org/slides/challenges-of-the-vr-web-by-diego-marcos-and-salvador-de-la-puente.pdf">PDF</a></li>
+                                <li>Slides: <a href="https://webengineshackfest.org/2017/slides/challenges-of-the-vr-web-by-diego-marcos-and-salvador-de-la-puente.pdf">PDF</a></li>
                             </ul>
                             <ul class="list-inline">
                                 <li>Date: Wednesday 4th October 2017</li>