TD,
Before you go further down this road, I would like to suggest you consider the scope of this event. If you do a Dave and Busters event, it's a BIG logistical hassle. Make sure you've got time and energy to manage it. Get contact info from people like PHArchivist or Army Scout, both of whom I believe have organized events through D&B in the past. You've got to get in touch with the D&B folks, figure out a dinner menu, figure out how many people are COMMITTED to coming, then decide your room size, then collect funds, etc. Lots of stuff to worry about. Lots of details to attend to, and it can be a hassle.
Another alternative is to host it at someones apartment complex. I've done this a couple of times in the past, with great success. Lots of condo's and apts in Orange County have "community rooms" that can be rented for 100 to 200 bucks a day. It's usually a more "intimate" environment (and you RPEffers KNOW I love intimacy!!!!!) and can be a bit less hostile. (usually at D&B, there's NUMEROUS non-rpeffers wandering in and out of the room. Can be a mixed bag as far as good or bad) Downside is that there's no cash bar, and tend to be fewer hot chicks and hot moms. It also usually makes a lot more sense for smaller groups. If it's just ten of you, D&B might not be able to work a deal with you.
I'm happy to volunteer my complex's community room if you decide to go that route.