This stuff is golden!!!!!! If I can add a few-
During the 'keynote address' on the sunday afternoon... snore... loudly.
If you are sat towards the end of a row and have the situation where you have to stand up for people to get past you (probably every convention in the UK at least)... fall asleep with your legs out as much as possible.
Take notes.... but say everything you write down OUT LOUD
Sneeze loudly and then pretend to wipe snot off the shoulders of the person in front of you.
Open a can of coke just an inch or 2 away from the ear of the person sat in front of you... or.... shake the can up really hard.... then open it.
When you see an attendant counting your section, get close enough to say "24....35.....68......56......71....." to make him lose count
Pretend you know the speaker and make things up about him, and tell the person next to you.... out loud.
Go dressed as an over-the-top-pimp
When in a large crowd of people, say "nice ass"
Sing really really out of tune.... and keep the note going until the next verse starts.
Wear the same pair of socks for the whole convention, then on the sunday afternoon, take your shoes off.