Kick off the iconic Butter & Egg Days celebration at the Petaluma Historical Library and Museum. Mayor Kevin McDonnell will read a proclamation honoring the 2026 Grand Marshal and the Good Egg award recipient — a community member who has kept Petaluma’s heritage alive. A heartfelt, neighborly start to the city’s biggest annual tradition.

Join an afternoon conversation with celebrated Bay Area artist Inez Storer, moderated by Donna Seager. Explore Inez’s approach to artmaking, her family history, and the personal stories that inform her powerful works on display in the concurrent exhibition States of Anxiety, States of Hope. Audience Q&A included. Admission: Free for Members / $5 Non-Members.

Petaluma’s signature celebration returns — this year themed “America’s Birthday — Petaluma Style” in honor of the nation’s 250th anniversary. The day kicks off at 10 AM with the Cow Chip Throwing Contest at McNear’s and the Cutest Chick Contest at 10:15 AM in front of Copperfield’s Books on Kentucky St. The Clover Kids’ Parade steps off at 11:30 AM, followed by the main parade at Noon featuring 100+ units and roughly 3,000 participants. The festival spans four city blocks with food, arts & crafts, two kids’ areas, live music, and beverage gardens (cashless). No pets, please.

Antique and collectible enthusiasts from across the Bay Area descend on downtown Petaluma for this beloved annual event. More than 200 dealers set up among the city’s stunning historic buildings, offering an exceptional range of affordable antiques, vintage goods, and collectibles. Admission is free. A perfect Sunday for browsing, hunting for treasures, and stopping for lunch at one of the many downtown restaurants and cafes.