The four-weekend-long San Francisco Open Studios (SFOS), presented by ArtSpan, is celebrating its 48th year with a welcomed return to in-person showcases after a couple of years of SFOS events were truncated due to the pandemic. The final weekend, Nov. 12-13, will be centered in the Richmond District with more than a dozen artists participating, each with a unique approach to creating and presenting their art to the public with no buffers.