Well, I got knocked out on the first day, only a few hours in. I think I played well, though, and I've made back my $1000 buy-in playing 1-2NL and 2-5 NL the past two days, so I don't feel too bad about it. My most questionable play was laying down KK on a jack-high flop. In that hand, my opponent was someone I'd played a tournament with before and he was about the tightest player I'd ever seen. He raised pre-flop in early position, I re-raised with my KK, and he re-raised me again. I probably should have folded here because I don't think he would have done that without AA or KK. I was being offered 5-2 odds, and I figured it was possible he had QQ... the only other real possibilities were AA or KK. He pushed all-in on the flop, offering me 2-1 odds. I folded. If I can't call there on the flop I really shouldn't bother calling pre-flop either.
The hand I was crippled on I had QQ and the flop came jack-high again. My opponent was a bit short-stacked and pushed all-in with AJ. I called and he caught an Ace to beat me with two pair. I was able to stay alive by doubling up with AA, but then the blinds increased to 50-100 and I still only had 500 (we started at 1500). In late position I pushed all-in with AKo behind two limpers. Everyone folded except the last guy, who called with Q9o and caught a pair to win.
Supposedly we set a new record for the largest live single-day starting tournament. This is because the really big tournaments like the main event have 3 starting days because they can't fit all the entrants on one day. Also, there were about 800 "alternates" for our tournament who took people's places once they'd been knocked out.