We plan to go along the route that google maps gives us from Phoenix - Seattle, and we're certainly willing to pick up anyone who wants to go. Long as you're willing to help defray some of the cost of driving
PAX is the Penny Arcade Expo, which is a big gaming meetup for nerds on the weekend of September 6th. 3 day tickets are 50$ and depending on how many people want to go and just where along the route you'll be the gas cost could be anywhere from 50$ to 200$
This is just to kind of gauge interest, at the moment there's no real definite plans for anything.

