Floyd Mayweather's next fight isn't just going to be a boxing match, it's also going to be a big music event, too ... 'cause TBE will be squaring up against John Gotti's grandson, John Gotti III -- -- and music superstar Ozuna will be performing!!
TMZ Sports is told the bash will go down on June 11 in Sunrise, Florida ... and Floyd (50-0, 27 KOs) is expected to make the exhibition bout official at a press conference on Thursday.
We're told Ozuna -- whose songs have billions of views on the internet -- will be taking the stage for a special set during the extravaganza .