Hey was just wondering about AX

im heading over to AX later on in the week and i was wondering whats going on there this is going to be my first convention and i want to know whats going on and what is worth going to ( i have looked though the roster of events)
in the fact that lot of stuff is TBA i don't have a a clue whats worth wile and if there is anything important i should know as a convention virgin

thanks in advance Anime Expo