Found my Revenge of the Sith ticket stub for 23rd of May 2005. The Ticket price was 9.50.
Other than that, I really can’t remember all that much of that screening the first time I saw the film.
I vaguely remember the opening space battle.
ROTS is the first Star Wars movie I remember seeing in the theater (May 21st, 5:15 PM, $6.25), though I’d seen all the previous ones before that on home video. We went with a group of friends, and I distinctly remember being pleasantly surprised at Palpatine trying to win Anakin over through subtle manipulation and the idea that the Sith had just as valid an interpretation of the Force that the Jedi did.
Unfortunately it didn’t stay that interesting for long and as we know devolved into Anakin going full evil and Palpy going full monster mash. I remember quite vividly the line 'What have I done?" being the moment that I emotionally checked out of the prequel trilogy.