opening ceremony with stars and pujian

hei awesome Tron fans!
OK! So anda know how when a uber awesome bad @$$ movie (like Tron) comes out? And all the stars come out, and they tunjuk off the cool pujian and people take pictures and ask questions-so in Tron they had the lightbikes and such? Seriously, how in heck do anda get invited to that? Cause there were pedestrian people there! I was just wondering when and where they announce that stuff? Cause I'll set up a camp and stand in line for a week..if it's worth it..like Narnia? Ick..Tron? Hell yeah! So yeah whose allowed and how do anda obtain the info!
Thanks!