In the crests of Elysian Park overlooking Dodger Stadium and downtown L.A., a group has formed a makeshift dance floor on an asphalt plateau tucked away from the park’s dusty trails and grassy hills.

They burst past the barricades and they’re ready to party, wearing leopard prints and fake furs. The outfits are appropriate as the first stop in this new-age party is what you might call an ...