Oof. Although I'm sure some exist far closer to you, the trouble is, of course, that the Venn diagram of "places suitable for the purpose at hand" and "places diametrically opposed to advertising their existence" is practically is circle. These are not establishments that are meant to make money. They exist to be discovered by those that deserve to be in the know, bless them all.

My recommendation? Set aside an evening and obtain an intoxicant of your choice. Imbibe it, and just start walking. Whenever you're confronted with a choice of which way to go, always pick the route less traveled or known to you. That simple algorithm will ensure you end up in places you might otherwise never have known, and, in my experience, that's exactly the kind of nook or cranny you're most likely to find the kind of place you're looking for. It's a certainty that'll you'll discover something interesting regardless. I've seldom if ever known this activity to be a waste of time.