@ NightLife LIVE, California Academy of Sciences, Golden Gate Park, 55 Music Concourse Drive. This particular evening in the ongoing NIghtLife series will offer opportunities to explore the science of taste and flavor with demos, tals and samples from some of the Bay Area’s most innovative tastemasters. 6pm. http://www.calacademy.org

@ El Rio, 3158 Mission Street. A legendary United Dems happy hour at the beloved neighborhood bar. 6-8pm. http://uniteddems.org