Tonight's Chocolate Madness at the Cyclorama
I went a couple years ago and it was great! I do remember there being a good number of people there, but I got to sample everything I wanted and don't remember there being lines or restaurants running out of samples. There were tables lining all the walls, one for each restaurant. Each table had a few small samples you could try - big enough to get a good taste, but small enough that you could try many different desserts. There was also a table or two with wine. I'm sorry I don't remember specifics, it was a couple years ago, but it was a great experience!
I've been twice and really enjoyed it. There are a lot of people, but not too many. You will get a chance to eat everything you want, at least once. Your chocolate craving will be sated.
If Christina's is there again, I would make sure to go there and see if they offer the Lavender White Chocolate ice cream again. Really quite spectacular.