Thinking back on what I used to do when I was stuck in the boring prison seats...
When I was a kid, I used to put both of my arms on the armrests, pretend it was the command chair on the deck of the Starship Enterprise. I'd blast things with proton laser beams and shit. Then I'd bank right, left, up, down... sometimes it even felt like I was moving. Other times I'd imagine that I was a ventriloquist, and think about putting words in someone else's mouth. Even better, imagining the ability to "ventriloquize" farts, and make other corners of the KH or assembly hall smell bad so I could watch reactions.
As I grew out of that, (who am I kidding? I never outgrew that) I'd play a personal game of "Fuck, Marry, Kill" with the audience. Or stare at the back of people's heads to see if I could make them uneasy. In the large arenas where the conventions were held, I'd look up in the rafters and use my acrophobia to give myself vertigo. Sometimes it really scared me.
As an adult, I'd volunteer for assignments to get out of having to sit in my seat. Anything was better than having to be in the auditorium. Good luck to you.