How about starting an IBIS gathering at PAX Prime!?!
http://www.paxsite.com/paxprime/index.php
Pax Prime 2010 was epic and a great place for IBIS members to get together and represent. They had a booth set up for Counterstrike.
Pro and Joe vs. Pro and Joe.... Lastgamer kicked some pro ass for ibis last year (the other joe was calling bullshit cause he thought Lastgamer was a Pro player). Im sure this year will be no different.
There is also Pax East which I will be attending for the first time this year.
http://www.paxsite.com/paxeast/
Its not E3 but its def worth the time for any avid gamer.