From jazz to salsa to samba, the San Francisco Bay Area is a vibrant hub of Afro-Latin music—and one of the reasons is percussionist John Santos, who for 45 years has played an essential role in bringing the full range of Afro-Latin music to a wide audience. On October 3, John—a generous teacher, performer, and recording artist—will join us in an online conversation about some fundamental Latin percussion instruments: tumbadora (conga drum), guiro, claves, cowbell, and chekeré. You don’t need…