Absolutely possible!
First, the group where the events are created will need to accessible to the members of the group where the content is being displayed. Only members who can view the calendar where an event is created will be able to view it where it is being shared.
- Go to the calendar where you wish to have the events shared
- Click Pencil Icon > Manage Group Theme > Edit this Page
- Go to the widget you wish to edit
- Click on
in the widget menu bar to open the configuration dialog box - Here you can select the group/calendar to pull content from
- Click Save to exit the configuration dialog
- Click Publish when complete