Events are how a group becomes a real plan — a place, a time, and an RSVP, attached directly to the group they came from. Everyone in the group already knows who's going before they show up.
Set a location, date, and time — it's automatically tied to the group it came from.
Members mark themselves as going, so everyone can see the headcount ahead of time.
A merge can host its own joint event, shared by every group in it and kept separate from each group's regular calendar.
Every event shows up on the Find tab, so it's easy to see what's happening nearby.