7. If you're young: get to the GA line early and chat up the older ppl in the line around you. They'll probably think you're cool for being so young and loving U2 and will buy you things (cold drinks, pizza etc.), generally help you out and tell you awesome stories that'll make you so envious, like the time they saw U2 in a small club with 40 people in the audience etc.
8. If you can, try to get a spot in line near someone with a guitar to have some awesome sing-a-longs.
9. Be nice to ppl in line and give them food so they'll hold your spot, maybe get you a good spot inside, lift you onto the stage etc.
10. Don't bring a ginormous sign that'll ruin the gig for everyone behind you. Also applies to big hats (WHY?!)
11. Blow Adam kisses, he will grin widely. You too boys.
12. Don't wear a Coldplay t-shirt to the concert. You will receive death glares.