Go out and pull the power meter out of the can... Throw it into the fountain...
Fill the fountain with bubble bath liquid!
Walk through the assembly hall with a paint roller and put paint on the back of all the chairs that's the same color as the chairs
Take a razor and nick the wire to the mike so that every time the brother goes to adjust it he gets shocked
Super glue quarters to the floor all over the building
Drop money with exploding dye packs into contribution boxes
Spray fake fart smell into the A/C air return
take all the bolts out of all the chairs in one isle
Dump several bags of ice into the baptismal pool right before everyone gets in
Dump lots of bleach into the pool so that everyone hair turns white
If your convention is at a war memorial go in military uniform... Load and fire the cannon in the foyer
Wait until the afternoon when everyone is starving pop some microwave popcorn in a battery powered microwave
Every time the speaker says something yell "I'll drink to that!"
Take your shirt off, in Florida (and I think the entire US) it's now the law that anywhere a man can go topless a woman can too! girls, take advantage of that law!
Shave with an electric razor, use an electric toothbrush to brush spit in your neighbors cooler
If an attendant says anything scream "SHUT THE FUCK UP I'M TRYING TO LISTIN TO THE TALK" At the top of your lungs
Whistle during the songs
Take a musical instrument and play along with the songs
If you don't have a musical instrument try to fart along
See if you can roll a unopened can of tuna from the nosebleed section all the way to the speaker!
Bring friends, do the wave instead of clapping
Play 'tazer tag.' What you do is bring a 60000+ volt tazer. Then during breaks walk around tazering the metal handrails! To keep score you get 5 points for every person that falls down +1 point for every 10 feet away they are! So a group of 4 elders 70 feet away=48 points! If more than 20 people go down you double your score! If you can get a visiting member of the GB you automatically win!
Glue the contribution boxes to the floor
Get freaky with your GF in the top row's... Have her scream Jehovah's name!
Sit down front with an IV drip, take constant blood transfusions
Bring a 'Seeing eye bear'
Release hundreds of goldfish in the baptismal pool... or one alligator