I went to the Infinitus event, and since it's semi-related to this, I'll tell you guys about it:
The event started at 10, and we were taken to the eighth Voyage of Sinbad theater. We were supposed to be getting a presentation, and while we were waiting there was a bit of an informal show going on with people dressed up as HP characters reanacting certain scenes. This turned out to be better than the actual presentation. A lady who I guess was high-up in Universal came and talked about WWoHP and showed us a video covering all the grand opening stuff. That was nice, but we were all still waiting for the good stuff. They ended up playing the NBC special, and at that point, I felt a bit cheated. It was supposed to be a presention by the 'brains of WWoHP'. I eventually left, and a good thing too, because I was in the front of the crowd to get in. The outside of the theater filled up fast, and they didn't let us in until 11:30. Everyone was pretty peeved especially since it was so hot and crowded behind the rope keeping us out. It was set to end at 1:30.
So they finally let us in, and it was pretty fun. They were handing out free butterbeer in smaller cups than usual ('cept you could just get back in line and get more). I headed straight to Ollivanders and then FJ. I rode FJ for my third time total, and it was as great as usual (only a 20 minute wait). After I got off the ride, I thought of going on it again, but it was closed. And their was still about an hour or a little less left of the event. I headed over to Dragon Challenge, but we couldn't rent lockers. It said they were all full even though we saw many people emptying their lockers. We didn't have anything to do with our wands, so we couldn't ride it. We went to ride Hippogriff (no wait) then headed off back to Dragon Challenge to see if the issue has been resolved. But, with 30 minutes still left in the event, they closed DC. So I just shopped with what little money I had left and got some butterbeer for the rest of the time.
Overall, it was fun, but I think many attendees felt a bit cheated because it was implied that we would have more time in the park, and the presentation would be exclusive and interesting, not something we can just watch on YouTube.