Rugby is where football started and its players and fans all share in a happy hysteria.
I am in no way suggesting you actually play rugby with its battering array of scrums, rucks and mauls. But there is a heavy schedule of games ( two halves each around 40 minutes) on weekends through the year to watch. Read up on it before you go so you’ll understand why the game barrels on even when a player is tackled or passing the ball is allowed but only backwards or forwards.
The San Francisco Fog is a unique club with people of color and gay men and women out in force. Check their website for game days and times.