Based on the search results, there are several fights happening tonight, but it depends on the type of fight and where it is being broadcasted. Here are some of the fights happening tonight:

• Richardson Hitchins vs. Jose Zepeda, a junior welterweight bout, is happening tonight and will be broadcasted on DAZN.
• Janelson Figueroa Bocachicas fight against Alberto Ignacio Palmetta will be broadcasted on ProBox TV US tonight.
• There is no information on any boxing fights happening tonight on ESPN.
• There is no information on any boxing fights happening tonight on Premier Boxing Champions.
• There is no information on any MMA fights happening tonight on MMA Fighting.
• There is no information on any boxing fights happening tonight on Showtime.
• There is no information on any boxing fights happening tonight on Boxing Scene.

Therefore, the answer to the question "what fight is tonight" depends on the type of fight and where it is being broadcasted.