Your organisation might be made up of several groups which can have their own events. Or you might want to group events together for another reason.
The template tag
displays the events that are coming up for a group.
Adding the event as a child of a group automatically assigns the event to that
group, or you can set the
field on the event.
It is not expected that you will both add an event as the child of a group and set the group_page field. But if you do then: if it is the same group, the event will only show up in the group once; if they are different groups, the event will show up in both groups, but will only show itself as belonging to the group that it is a child of.