If I understand the new feature correctly, this should be doable in Reunion 12.
- Open the Citations List
- For Who, select All people
- For Include, choose Citations in fields>Events>[the event you're interested in]
- This will create a list showing all the citations used for that event an the people they're associated with.
- Click on the "Marked" text on the bottom left corner of the list window and Select the Unmark Everybody in Family File, then Mark Everybody in List option at the top of the pop up menu.
- Go to the Navbar and select the Find panel, choose the "Unmarked" preset, and click the Find button.
- This will give you a list of people in the Sidebar who have no citations for that event.
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