Invitees are an optional feature for events that attaches a list of selected participants to an event. If check-in is enabled, those invitees are required to check in.
For Public events, invitees follow the same check-in requirement while all other viewers can see event details without being prompted.
The calendar type does not restrict who can be invited — an event on a Group calendar can include participants from a different Group, as long as those participants have Geo product access enabled.
