You have received so many good tips, so I will just reinforce one. I hope you will not feel intimidated because you will find that 99% of the attendees including speakers are friendly and very receptive to meeting new people. Just remember we are all geeks on the inside. :)

Most of us bear some resemblance to our pictures here on UT, so I hope you will be able to find me, Even, Ken and others from UT who will be there. Since over half the attendees are UT members, you will have good look finding many of us.