The website owner for the Beach Party is quoted in the Houston Press article aand says that Mardi Gras is the white people's version of this which just is not true.
Headliner this year at Mardi Gras was BB King. Last year it was George Clinton and Funkadelic-Parliment. Certainly these performers appeal to black people as well.
While topless flashing was permitted at Galveston, there was a prohibition on genital exposure. "Public sex" is also prohibited.
Even as it is, there are shootings and gun incidents at night in the area surrounding the Mardi Gras celebration. Of course, the fact that the Crips and the Bloods have staked claim on the turf surrounding the festival is just a coincidence.