Trumpet Masterclass with Paul Merkelo

Sun · Oct 25·3601 Lyon St, San Francisco

Cal Hacks 13.0 (3601 Lyon St, San Francisco) — 36‑hour hackathon offering workshops, industry mentors, corporate partners, food, swag, and prize pool of cash and devices.

Sun · Oct 25·5 AM·Event Location, San Francisco

Cycle Track open until 10:00 AM at Event Location, San Francisco.

Sun · Oct 25·8:30 AM – 4:30 PM·San Francisco, CA (Farallon Islands)

Eight‑hour naturalist‑led whale watching expedition sails from San Francisco under the Golden Gate Bridge to the Farallon Islands, featuring an expert naturalist, $320 per person, ages 13+.

Sun · Oct 25·8:30 AM – 10 AM·SF Botanical Garden · San Francisco

Sophia Di Piazza leads a free guided walk in the San Francisco Botanical Garden, examining pollinators, beetles, true bugs and other insects; $5‑20 suggested donation, all ages.

Fri · Oct 23·6 PM – 10 PM·Sol Joseph Recital Hall · San Francisco

Guitar Masterclass with Gaëlle Solal at Sol Joseph Recital Hall, San Francisco.

Fri · Oct 23·7 PM – 11 PM·Barbro Osher Recital Hall · San Francisco

Piano Masterclass with Boris Slutsky at Barbro Osher Recital Hall, San Francisco.

Fri · Oct 23·7:30 PM – 11:30 PM·Caroline H. Hume Concert Hall · San Francisco

SFCM Wind Ensemble Concert (Caroline H. Hume Concert Hall) — wind ensemble performance.

Sat · Oct 24·7:30 PM – 11:30 PM·Caroline H. Hume Concert Hall · San Francisco

Jeeihn Kim performs a first‑year master’s violin recital at Caroline H. Hume Concert Hall.