What makes these worth flagging: free DnB in SF usually means a bar night with one DJ and a speaker system borrowed from a dentist's waiting room. Luna Assassin has a consistent following in the Bay Area underground circuit, and The Midway's production setup is legitimate — the laser spec alone suggests someone is treating this as more than a Thursday fill. The dance film component at The Midway is unusual; it's not common to get audio-visual programming alongside a live sound event at that volume.

Practical note for The Midway: the neighborhood is industrial and parking is easier than you'd expect, but it's a dead zone for late-night food. Eat before. For Underground SF, Tornado on Haight is a block away if you want to pre-game with a beer list that will occupy you for longer than you planned.

If you have two hours, hit The Midway early — catch the film element before the floor fills, then stay for the lasers.