If you’re selected to become a seat filler, it’s important to know that there are a few ways you could lose your privilege. The Seat Fillers website makes it clear that you aren’t allowed to talk to the celebs at the event, bring any guests that weren’t pre-approved, bring any sort of camera equipment inside (duh), or ask for autographs.
Remember, this isn’t a paid position, so if you break the rules, you might get kicked out.
Source: https://www.distractify.com/p/how-to-be-a-seat-filler-at-the-grammys