If you don't use Google Calendar but rather use something else, you'll want to look for an option to import or subscribe to an iCalendar file (.ics) - luckily, this functionality is built into most calendar systems.
Once you've found it, you'll want to copy
into the "website" or "URL" field of your chosen app.
Unfortunately I can't provide instructions for all of the likely hundreds of different places one could use this, but here are instructions for a few:
(note that many calendar apps, especially for phones, directly use the calendars added in your phone's settings, so you need only to add it there)