Yah, I sent my reply by e-mail. I'm going to LA for the first time because of this screening. It's very exciting. I'd like to meet up with you guys if possible.
A handful of users have reported receiving their confirmations already. I wrote to RED last night, and they kindly responded that I would receive my confirmation in a day or two. It seems that the way their system is set up locks you into position in the order you reserve something, but they don't necessarily get back to you in that order. They are probably just swamped right now with last-minute camera reservations and, now, requests to be added to the audience at the screening (remember, the public screening is available to anyone in the world - not just RED reservation holders, or even people on these forums). My guess is that unless you get an autoresponse saying that your email could not be delivered, they've got it - they just need some time to process it. But I understand your concerns... the wait had me nervous for a moment!