Calvin Vargas became part of the action during the Beach Boys concert at the L.A. County Fair’s End of Summer Concert Series.

Calvin, 17, was pulled on stage and jammed with the Beach Boys and special guest John Stamos.

His proud older sister, Cloris Vargas, was excited to see her brother in the spotlight.

“He is an amazing person that goes to Diamond Bar High,” she said. “He has a disability called Williams Syndrome, and is a spokesperson for Best Buddies at Diamond Bar High School.”