Night of Joy is a "hard ticket" event, which means that at the end of the MK day, they'll empty the park, and only those folks with a NOJ ticket will get in. That obviously limits the number of people in the park, although it can still get a bit crowded.
All the rides and shops are open, and some of the restaurants. There are stages set up all throughout the Park -- one in Frontierland, one in Tomorrowland, etc -- and they also utilize the Castle Forecourt stage and other performance areas that are already there. There is no parade, but usually some type of fireworks display. But the draw is the concerts, which are all Christian rock or Christian soul groups. The demographic is older teen through late 20s, with a batch of thirtysomethings as well. As you get into the "middle ages," you'll see fewer and fewer folks ... it seems to be mostly a 40-and-under event, although all ages are welcomed.
This year's talent line-up is: September 9 Avalon, Jars of Clay, 4HIM, FFH, Michael W. Smith; Point of Grace, Mark Schultz, and Across The Sky; September 10 Steven Curtis Chapman, Third Day, Rebecca St. James, Stryper, Skillet, Downhere, Warren Barfield; Sonic Flood; September 11 Kirk Franklin, Jaci Velazquez, Ce Ce Winans, Salvador, Jeremy Camp, Joy Williams, Jump 5, 12 Stones.