I recently went to a cropping night at Recollections in Arlington. This was my first time going to one of these things and I have to say it was fun.
Recollections has plenty of workspace to create and great ideas posted on their bulletin boards (which I failed to even SEE until it was almost time to leave). They have die cut machines with lots of different die and a computer and printer for journaling.
The crop started at 6:00 and went until midnight. They even feed you dinner (Olive Garden yummy).
I went for a birthday party crop, but if you're simply looking for a fun time getting together with friends to scrapbook or make cards, I recommend a Recollections crop night.