H₂O₂ is a pop-up gay bar in Helsinki's Kallio neighbourhood, on Kaikukatu, with the entrance at the back of the courtyard. It describes itself as a temporary gay and LGBTQI+ bar welcoming all queer people, for drinking, dancing and cruising.
It runs in seasons: the second season opens on Friday 2 October, and the bar publishes its event dates through a newsletter.
