Golden West is a restaurant during the day/evening and then they move all/most of the tables out from one side and have shows at night. Shows typically start around 10 PM (so, yes, it can be a late night if you're driving up from DC and staying through the headliners). They do still have the kitchen open, at least for a little while, when they have bands play, and they've got a good vegetarian/vegan selection (as well as meaty stuff for all you omnivores)-- just place your order at the bar.
It's a good space; I've seen a couple of shows there (Indian, Batillus, Thou, the Body). Sound is usually pretty good. No real "stage lights", so it's difficult to photograph without a flash, if you're into that.
For Alcest, though, I'll probably stick to the DC show since Auroboros (ex-Baroness/Salome) is opening here.