Silicon Clean Water Plant | 2026-09-17 | 10:00 AM | Noon | dropin | Contact John Jordon to sign up. Pickleball | Mon,Thu | all | 9:00 AM | 11:00 AM | dropin | The Pickleball group plays on Monday and Thursday mornings at 9 a.m. We play "drop-in" pickleball, meaning you don't need to bring a partner. Just show up and you'll be playing in no time — there are usually people at all levels, so there's lots of variety in the matches. Golf - 9 holes | Tue | all | 9:00 AM | | dropin | Casual 9-hole golf on Tuesday mornings. No sign-up — just come out and play. Genealogy Group | Wed | 2 | 3:00 PM | 4:00 PM | dropin | The Genealogy Group meets on the 2nd Wednesday of the month, 3:00–4:00 p.m., via Zoom. A friendly monthly gathering of SIR members who share a fascination with family history — research methods, family-tree software, and sources for tracking down our ancestors. All SIR members welcome — no sign-up required; watch your email for the Zoom link. Tech Club | Tue | 4 | 10:30 AM | 12:00 PM | dropin | The Technology Club meets on the 4th Tuesday of the month at 10:30 a.m. This month we are meeting at the Downtown Redwood City Main Library (community room) located at 1044 Middlefield Road. The presentation is on converting your old VHS tapes to digital MP4. Stock Study Group | Mon | 2 | 10:00 AM | 12:00 PM | dropin | The Stock Study Group meets on the 2nd Monday of the month at 10:00 a.m. at the San Mateo Senior Center, for about two hours. A monthly gathering of SIR members who want to understand the stock market better — through open discussion and active participation, not lectures. All members welcome; no sign-up or experience required. For education and discussion only — not investment advice or a recommendation to buy or sell. Golf - 18 holes | Wed | not 2 | 10:00 AM | | register | https://sirsanmateo.wildapricot.org/event-6766348 Golf - 18 holes | Thu | 2 | 10:00 AM | | register | https://sirsanmateo.wildapricot.org/event-6766348 Bowling | Thu,Fri | all | 10:00 AM | | dropin | Drop-in bowling on Thursday and Friday mornings at 10 AM. Beginners and seasoned bowlers alike. Cards - Cribbage | Thu | all | 1:00 PM | 3:00 PM | dropin | Cribbage on Thursday afternoons. New players welcome — we'll teach you. Bocce | Fri | all | 10:00 AM | | dropin | Drop-in bocce on Friday mornings. No experience needed — equipment provided. Cards - Hearts | Fri | all | 12:30 PM | 2:30 PM | dropin | Hearts on Friday afternoons. A friendly, social game — all are welcome. Book Club | Fri | 2 4 | 1:00 PM | 2:30 PM | dropin | The book group meets every two weeks on Friday 1:00-2:30pm. We alternate between a discussion of the book selected by a member, which all members read, and an open discussion of book-related and other topics of interest to the group’s members. Beer Tasting | Fri | 3 | 3:00 PM | | dropin | Our meetings will be held at 3:00 PM on the third Friday of each month. This month's gathering is at Fieldwork - 3030 S Deleware St. San Mateo. Monthly Luncheon | 2026-08-12 | 11:30 AM | | register | https://sirsanmateo.com/event-6785282 Monthly Luncheon | 2026-09-09 | 11:30 AM | | register | https://sirsanmateo.com/event-6821978 Monthly Luncheon | 2026-10-14 | 11:30 AM | | register | https://sirsanmateo.com/event-6830263 Monthly Luncheon | 2026-11-11 | 11:30 AM | | register | https://sirsanmateo.com/event-6831866 Pickleball Clinic | 2026-08-24 | 11:15 AM | 1:00 PM | register | https://sirsanmateo.wildapricot.org/event-6757893 Pickleball Clinic | 2026-09-28 | 11:15 AM | 1:00 PM | register | https://sirsanmateo.wildapricot.org/event-6757893 Pickleball Clinic | 2026-10-26 | 11:15 AM | 1:00 PM | register | https://sirsanmateo.wildapricot.org/event-6757893 Pickleball Clinic | 2026-11-23 | 11:15 AM | 1:00 PM | register | https://sirsanmateo.wildapricot.org/event-6757893 Pickleball Clinic | 2026-12-28 | 11:15 AM | 1:00 PM | register | https://sirsanmateo.wildapricot.org/event-6757893