I have an overlay on a calendar and I am able to see the events in calendar view but not in the All Events list view. Is there a way for the overlay calendar to show in the All Events view? Or is the calendar view the only view that it works on?
Overlays are for the calendar views only. The AllEvents view is a standard list view and so will only show the items for the calendar list it is associated with.
If you want to combine multiple calendars in a list then you'll need to use either the Content by Query web part or the Content by Search web part.