TAM4 stands for The Amaz!ng Meeting 4 and it's going on right now (January 26th to 29th) at the Stardust in Vegas. It's essentially a skeptics convention put on by the JREF (James Randi Educational Foundation).
Guests include James Randi (of course), Penn & Teller, the Mythbusters, Phil Plait, Murray Gell-Mann, Ellen Johnson... a huge range of people that I'd love to meet and listen to speak.
I wasn't paying attention to when TAM4 was scheduled, but I REALLY wanted to go. I thought it was much later in the year. I'm seriously bummed. I'm going next fucking year. >.<