So far as I know, there aren’t a lot of 8-player local multiplayer games. The only obvious answer is the Jackbox games, using your phones as controllers.

Beyond that, I did find this Steam curator, who seems to specialize in 8-player games. From thier list, I recognize Gang Beasts, and Pico Park: Classic Edition. Party Golf, Screen Cheat, and Cobalt also all looked interesting, but I’ve never seen anyone play them.