District Management / General Settings / General District Setting / Events & Announcements / Allow end users to create events for the following institutes
Here, you define for which institutes an event could be created. (Figure 1)
Figure 1
Here you are able to create an Event. (Figure 2, 3 & 4)
Figure 2
Figure 3
Figure 4
In order to create a multi-institute event, you need to enable Is District Event in Calendar Category. (Figure 5 & 6)
Figure 5
Figure 6