The Unity Event Grouper has an ActivateNamedEvent
function that can be called by other linkers. This function will find the group with the specified name and invoke its events.
Consider the following example where you have multiple events that invoke the same behaviour:
If at any point you decided to change any element of this behaviour, you would have to go through and update each event.
This can be tedious work, but by using an event group, you can create your behaviour once and invoke it from any number of events: