I was there!

And it was absolutely insane! The fans were vicious! We arrived at 12pm at Leicester Square and there were already hundreds of people there. They had a huge backdrop of Hogwarts Castle, a dragon, a giant Triwizard Tournament cup, and giant video screens for those who couldn't get into the square due to the crowds. We waited basically in the rain and COLD until 5ish when the stars started showing up, but it was worth it and a lot of fun! I got to see most of the main cast, even though some were only glimpses because I am very short.

I am now VERY tired after standing all day but have some great photos and lots of fun memories! Oh, and the celebrities were all inside the theatre by 6:30 approximately.