I don't want to see any all encompassing 50th anniversary "celebration." There's no need for it, and it will ultimately overtake the film's plot.
I was glad they didn't do anything like that for Bond. It was nice to see EON learned its lesson with Die Another Day
At best, maybe have an old Kirk appearance. If Shat can't make it, then maybe just toss in a few minutes of egghead wizards with a spider vein problem.