Mick LaSalle May 18, 2021Updated: May 18, 2021, 6:09 pm Chucho Valdés performs at SFJazz Center. Photo: Scott Chernis, Photo By: Scott Chernis The San Francisco Jazz Festival plans to go virtual for the second year in a row with two dozen broadcasts of archival festival performances, despite the city’s move to allow more in-person events. But that doesn’t mean all the offerings will be virtual during the festival’s run, which is set for June 4-25, said Randall Kline, founder and executive artistic director of SFJazz. “We’re easing our way back into it, one toe at a time,” he said on Tuesday, May 18.