Well that is not bad at all - about the same for me, I think, yours maybe even shorter.
For a group this size we might consider the dorky concept of the chain or lanyard ID
cards around our necks, like you use at some large companies, with the AA logo on it.
Okay - forget I said that! I'm the one at the seminars who refuses to wear the "HELLO, My Name Is ___________" stickers they want you to put on your shirt.
When we met in NY Andy (QTOFFER) printed out a 8.5x11 AA logo and held it up, and I think it was a great idea, but this group is going to be bigger. The Aquarium may have something they provide for large groups like this.