Sunday marks the 45th anniversary of the UpStairs Lounge arson, a flash fire that killed 32 people in the New Orleans gay bar on June 24, 1973.

Until the Pulse nightclub massacre in 2016, it was the deadliest attack on a queer venue in U.S. history. But the event is still relatively unknown, even within the LGBTQ community.

The UpStairs Lounge, a second-floor bar in New Orleans French Quarter, featured a pianist and drag shows, and was enjoyed by a diverse crowd.