You'd have to pull 75 people every time, right? And you're talking about the iLounge, not the main room? Place holds a couple of hundred comfortably...look, I have no idea what the geographic spread of the potential audience for this is, but I can read the locations below the avs here and see that there are only a handful of DGNers (at best) within a 15-20 minute drive of the place. If Pontiac is what you're looking at, have you thought about one of the smaller rooms at the Crofoot? The Pike Room, perhaps? You put on one show there already, and you at least know who/what you're dealing with.
I do hope you find a place to do this.