I went to one when I was in college in Mississippi. It was incredibly entertaining. I had to write a paper on it for a philosophy class.
It was heavily advertised, and it was clear that this was the biggest event on the church's calendar. Signs up everywhere and all the church members were wearing official event shirts. My biggest complaint in the whole thing was that they spelled it "judgment" with the "e". I know that spelling is accepted by some, but they're wrong. It's "Judgment". OK, off that soap box....
The whole spectacle was impressive (in an amusing kind of way), and the staff were taking it very seriously. We were split into groups of 20 or so, then ushered from room to room to hear pieces of an ongoing story. It was about two groups of teenagers on a Friday night: one group was holy, and the other was sinful. In one of the rooms we saw the holy group sitting around a table, drinking soda, and studying the Bible. In another room the sinful group was sitting around a table, listening to rock music, drinking (fake) beer, smoking (fake) cigarettes and playing poker. (Sidenote: I'm clearly a sinner, because the latter group was much more appealing to me).
Then we were taken outside where there was the wreckage of a car crash involving all of the teenagers, many of whom were now dead. From there we went to the pearly gates where the dead teenagers were all lined up, awaiting entrance. But to our shock, the sinful teens were found guilty and not allowed in. So we followed the sinners into hell. Let me just say - Wow, what a place. It's loud, and dark, and there are fire pits everywhere. And worst of all, Satan himself is sitting on a throne--illuminated by a strobe light--laughing and taunting the sinners. They called for help, but Satan and his demons just kept laughing while they kicked the sinners into the fire pits.
They ended up letting us leave that room, and thankfully we were able to catch a happy ending. We followed the holy teens through the pearly gates and into paradise. Heaven was very peaceful and everyone wears white. There was a (fake) flowing brook and some soothing harp music. There was also this funny bearded guy who walked up to each of us, placed his hands on our shoulders, and (seriously) said "well done, my good and faithful servant."