We have the ballroom until 2am. We have a band but I am thinking of having Karaoke from 12am-2am after the band. Is this feasible? How long does the band usually need to break their equipment down and can the Karaoke get set up quickly, or do you think this is too much of a break in the festivities?

As far as the Karaoke goes, I would say it depends somewhat on your guest list. Generally, most middle aged to older guests would already be gone by midnight or be happy to wrap up the long day (especially if they have to drive any distance to get home). Younger guests may be happy to party all night. You may find that when the band stops playing and packs up that your guests will take the cue and leave also. The time needed to break down band equipment depends on the size of the band and the amount of equipment they have set up. There is probably not much involved in setting up for Karaoke - a microphone, a CD player & speakers (and someone assigned to change songs, etc.) You may even have some of this set up on the side, before the band starts, so you can be ready when they are through.