...Shadowrun.
I conned my business partner into agreeing to host a one-shot campaign in one of the conference rooms at our gallery during the event, something about SR fitting the theme because it has Street Samurai--the point is I rolled well, and it's happening.
As mentioned, there will be food, drinks, and entertainment, as well as a projector in the conference room for either maps and visual aids or to provide video entertainment for the 1 IP characters between combat turns, (or while the hacker's doing his thing) depending on what we get together. I'll also be DJ'ing a soundtrack for the game as we play.
I've already told my regular gaming group about this, but I wanted to put the call out there so anyone in the area can come by and join in. I haven't got a solid commitment from my group's GM, so it will probably be either him or me running the show--though I'd be happy to lend the reins to any more experienced GM's that show up.
Expect a drop-in, one-shot campaign with a blockbuster movie feel. Pre-made characters will be on hand for anyone who doesn't have their own (or needs another one after their's get's fragged), as well as a complete collection of SR4 rulebooks in PDF format. You can even borrow my dice if you need to.
The art opening will run from 5 to 7 pm, but the game can continue as long as we want, I'll be there all night. This may be an art gallery in a corporate business center, but the attitude is very laid back, and typical gamer dress/behavior is both acceptable and expected--just leave your monowhips and other restricted gear in the car, and keep the criminal activities in-game.
The gallery is located in the San Luis Business Center at 4251 South Higuera, Suite 800, at the intersection of South Higuera and Los Osos Valley Road. It's the big 2-story building in the middle of the complex, you'll be looking right at it if you come down LOVR. Just come in through the double glass doors facing the street, and I'll show you to the conference room. Keep in mind the doors are tinted, so it may not look like we're open when you get there. Guest parking is available in front, behind, and to the left of the building.
Here's a link to Google Maps to help you locate and identify the place.
I'll be posting more details throughout the week as they become available.
-- Reiku Hiteruo, Co-owner of Art Zero and The Executive Gallery
Don't worry, I'm actually a nice guy in person.

[EDIT]
Game is going to be 400 BP + 20 karma
Houserule on rocket and missile scatter: it only happens when you miss
Advanced lifestyles allowed
Otherwise pretty much RAW
Without giving too much away, the run will involve breaking into a Renraku R&D lab on the top floor of a skyscraper. Also, there will be lots of people after you. Contacts, Combat, and Hacking/Stealth would be good areas to focus on, but I intend to include a little bit of everything, so bring whatever character you want, and I'll adjust the challenges accordingly.