Since the Charros no longer operate, neither the team nor United League Baseball is running any tryouts. If you are interested in becoming a professional baseball player, and you are considering the independent professional baseball leagues as an option for your career, then there is a service which notifies you of upcoming open minor league baseball tryouts, instructional and developmental winter and spring leagues, third-party independent baseball showcases and more.
That resource is:
The service is run by a longtime veteran of the independent professional baseball leagues. He was a catcher, bullpen catcher, team official, and league official and he runs industry-wide websites pertaining specifically to the independent leagues.