I've been to lots of 'underplayed' nights over the years, and I've also been to lots of oldies nights to counter balance the argument. The simple thing is that most people don't want educating, they want to go out and enjoy themselves. The other simple thing is that records remained underplayed in the old days because they weren't up to scratch, doesn't matter if they float one person's boat, it's whether or not they appeal to the masses. Play to your crowd, book DJs who follow the venue ethic and that will generate some success.
If you've got vests and bags at the venue, then the music required pretty much chooses itself......doesn't it?
Winnie