It’s a real sha’alah. I think the seforim deal with that particular sort of problem. In Talmidical terms it’s called “mareh makom hu lo”.
Kidding aside, I’ve seen such. And there’s one who’s a close friend, and I don’t know where on earth the hall is (actually I know it’s somewhere in the state of New York). If you’re only inviting people from the immediate surroundings, nu – why bother. But if you plan on inviting someone not from that neighborhood (and you really want them to attend), I would think it’s common sense to put an address on it too.
(maybe to save on ink, print two sets of invitations…)