Strut, 470 Castro, 1st & 3rd Floor. The oldest public open drawing group in the world celebrates 30 years of drawing the male nude in San Francisco with an exhibit of drawings by current and past participants in the weekly drawing group founded by photographer/artist Mark Chester. markichester.com

San Francisco Museum of Modern Art, 151 Third Street. Presenting for the first time side by side the art of two of the 20th Century’s most extraordinary painters. sfmoma.org

Daily through May 25 @ San Francisco City Hall, 1 Dr. Carlton B. Goodlett Place. SF Arts Commission’s exhibition of work by legendary 60s rock n roll photographer Jim Marshall and a new Market Street Poster Series featuring contemporary perspectives on the Summer of Love. sfgov.org

@ 24th Street (between Treat and Bryant). SF’s annual festival celebrating the Cesar E. Chavez Holiday in the Mission neighborhood. cesarchavezday.org

San Francisco Botanical Garden, 1199 9th Avenue. An exhibit of nature illustrations by Rachel Diaz-Bastin open through April 30. Sfbotanicalgarden.org

@ PianoFight Second Stage, 144 Taylor Street. A play by Dan Giles about two men who are about to have a baby. 5:00 pm happy hour; 7:30 show, repeating through April 29. faultlinetheater.com

@ Harvey Milk Photo Center, 50 Scott Street. An international exhibit on the photography, art and athleticism of skateboarding. 5 pm – 8 pm. Exhibit continues through May 31. harveymilkphotocenter.com

@ Brava Theater Center, 2781 24th Street. Playwrite Javier Huratado’s bilingual coming-of-age story presented Mission Academy of Performing Arts. 7 pm repeating on April 29. brava.org

@ Feinstein’s, Hotel Nikko, 222 Mason Street.   Award-winning comedian and author returns for two performances. 8 pm repeating on Saturday,  April 29, 7 pm. feinsteinsatthenikko.com

@ Ivy Room, San Pablo & Solano Ave, Albany. 8 pm. ivyroom.com