If it ain’t broke, don’t fix it and there’s nothing about Viva! Pomona that needs to be fixed. Founder Rene Contreras celebrated the sixth birthday of his little festival that could in Pomona this past weekend with yet another stellar lineup of local and international independent artists that struck a perfect balance between Latino artists and everyone else.

Opening the Fox Theater Pomona was an audacious, ostentatious, expensive proposition—both times. Its original grand opening on April 24,...