The Petalumans of Yesteryear offer regular guided tours of downtown Petaluma. New this year, they are rewinding to the first half of the 20th century and using an old-school toy to lead a walking tour of historic buildings. On Sunday, May 2, 2026, the group's inaugural "View Master Tour: Petaluma Rewind," led by Sherri and Leif Ortegren, guided guests to specific locations where they stopped to learn about history, then looked through a View-Master loaded with custom slides featuring images from the 1900s through the 1940s to see what the site used to look like.