diff --git a/src/PowerSimulations.jl b/src/PowerSimulations.jl
index 73cc11e950..27d2b01299 100644
--- a/src/PowerSimulations.jl
+++ b/src/PowerSimulations.jl
@@ -429,6 +429,7 @@ include("core/parameters.jl")
 include("core/service_model.jl")
 include("core/device_model.jl")
 include("core/variables.jl")
+include("core/event_keys.jl")
 include("core/auxiliary_variables.jl")
 include("core/constraints.jl")
 include("core/expressions.jl")
diff --git a/src/core/constraints.jl b/src/core/constraints.jl
index ac0f75957e..f63b73fc79 100644
--- a/src/core/constraints.jl
+++ b/src/core/constraints.jl
@@ -86,6 +86,9 @@ struct ActivePowerVariableLimitsConstraint <: PowerVariableLimitsConstraint end
 struct ReactivePowerVariableLimitsConstraint <: PowerVariableLimitsConstraint end
 struct ActivePowerVariableTimeSeriesLimitsConstraint <: PowerVariableLimitsConstraint end
 
+abstract type EventConstraint <: ConstraintType end
+struct OutageConstraint <: EventConstraint end
+
 # These apply to the processing of constraint duals
 should_write_resulting_value(::Type{<:ConstraintType}) = true
 convert_result_to_natural_units(::Type{<:ConstraintType}) = false
diff --git a/src/core/event_keys.jl b/src/core/event_keys.jl
new file mode 100644
index 0000000000..9c2a370a6f
--- /dev/null
+++ b/src/core/event_keys.jl
@@ -0,0 +1,22 @@
+abstract type EventType end
+
+struct EventKey{T <: EventType, U <: Union{PSY.Component, PSY.System}}
+    meta::String
+end
+
+function EventKey(
+    ::Type{T},
+    ::Type{U},
+) where {T <: EventType, U <: Union{PSY.Component, PSY.System}}
+    if isabstracttype(U)
+        error("Type $U can't be abstract")
+    end
+    return EventKey{T, U}("")
+end
+
+get_entry_type(
+    ::EventKey{T, U},
+) where {T <: EventType, U <: Union{PSY.Component, PSY.System}} = T
+get_component_type(
+    ::EventKey{T, U},
+) where {T <: EventType, U <: Union{PSY.Component, PSY.System}} = U
diff --git a/src/core/parameters.jl b/src/core/parameters.jl
index d14c113c26..c20086c733 100644
--- a/src/core/parameters.jl
+++ b/src/core/parameters.jl
@@ -310,6 +310,8 @@ struct CostFunctionParameter <: ObjectiveFunctionParameter end
 
 abstract type AuxVariableValueParameter <: RightHandSideParameter end
 
+struct EventParameter <: ParameterType end
+
 should_write_resulting_value(::Type{<:ParameterType}) = false
 should_write_resulting_value(::Type{<:RightHandSideParameter}) = true
 
diff --git a/src/simulation/simulation_sequence.jl b/src/simulation/simulation_sequence.jl
index 2ea134f7a9..dde88ceffb 100644
--- a/src/simulation/simulation_sequence.jl
+++ b/src/simulation/simulation_sequence.jl
@@ -240,6 +240,7 @@ mutable struct SimulationSequence
     horizons::OrderedDict{Symbol, Int}
     intervals::OrderedDict{Symbol, Dates.Millisecond}
     feedforwards::Dict{Symbol, Vector{<:AbstractAffectFeedforward}}
+    events::Dict{EventKey, Any}
     ini_cond_chronology::InitialConditionChronology
     execution_order::Vector{Int}
     executions_by_model::OrderedDict{Symbol, Int}
@@ -249,6 +250,7 @@ mutable struct SimulationSequence
     function SimulationSequence(;
         models::SimulationModels,
         feedforwards = Dict{String, Vector{<:AbstractAffectFeedforward}}(),
+        events = Dict{EventKey, Any}(),
         ini_cond_chronology = InterProblemChronology(),
     )
         # Allow strings or symbols as keys; convert to symbols.
@@ -273,6 +275,7 @@ mutable struct SimulationSequence
             horizons,
             intervals,
             _attach_feedforwards(models, feedforwards),
+            event,
             ini_cond_chronology,
             execution_order,
             executions_by_model,