Haunted Underground turns parts of Underground Atlanta’s bar corridors into a Halloween experience. Downtown Atlanta’s Saturday calendar lists an 8 p.m. opening tonight.

This is a nightlife activity, not a family trick-or-treat event. The listing describes it as 21-plus and recurring Thursday through Sunday in October.

Admission details and the evening schedule should be checked before heading downtown. It could fit after dinner or a concert.

Action: confirm tonight’s entry details and decide whether a short late-night visit appeals.