This story is part of Image’s December Revelry issue, honoring what music does so well: giving people a sense of permission to unapologetically be themselves. The belt used to belong to his father. Black leather, silver stitching, “RUBEN” spelled across the side with the initials “R.V.” on the buckle, for Ruben Vallejo, a name both men share. Now it sits on the waist of the younger Vallejo as he gets ready for a night out at the Pico Rivera Sports Arena, a place he’s been to “over 50 times,” he says, but this one’s special. He tucks in his thrifted button-up shirt, adjusts his belt buckle and looks in the mirror. For the Vallejo family, the arena is a second home and dancing there is tradition. It stands as a cultural landmark for Los Angeles’ Mexican community, hosting decades of concerts, rodeos and community celebrations. Vallejo’s parents first started going in the early ’90s, when banda and corridos began echoing across L.A. Tonight, the beloved crooner Pancho Barraza is performing and Vallejo is going with …