Santa and Mrs. Claus make a unique arrival when they sail up the Petaluma River on a tugboat and dock at River Plaza Shopping Center. Saturday, November 30. 11:30 a.m.–1:30 p.m. Take photos with Santa and Mrs. Claus until 1:30, then take your holiday shopping list and make the short walk to historic downtown Petaluma for Shop Small Saturday featuring special offers and activities. River Plaza Shopping Center. 50 E. Washington St., Petaluma. For more information, visit tinyurl.com/56atcxdy.