I submit my suggestion for a venue for next year's Penny Arcade Expo.
The Everett Events Center
For those of you that don't know, Everett has a new hockey stadium and events center (less than a year old). It is an enormous venue that I believe is a perfect fit for this type of event.
I for one have been to a SIMILAR event before at the EEC. It was the lanpartynw.com 200 MAN LAN. Here there was a huge room that seated 200 people with PCs, while there was 10 TVs along the hall outside. These of course being the TVs on which I first had my ass handed to me in SC2 by Zig. There are actually two conference rooms that are back to back (same size) on that floor (as well as rooms all over the venue).
I say you have one of those rooms as the console room, and the other as the PC room (with up to 200 people allowed into the LAN). The table-top gaming can find a place downstairs, and the concerts and theater could use none-other than the hockey stadium itself. Gabe and Tycho said that EVERYONE should be able to see the Minibosses, and that's how I think it could be possible.
All and all the only thing bad about this venue is that it can be expensive to rent. But I think it lies within the buget of PAX.