Petaluma's best loved event returns for its 31st year! This year's theme will celebrate our River heritage with "River of Dreams: Then & Now ".  Watch over 110 units march through Downtown Petaluma, enjoy food and drink, music, arts and crafts and an area just for kids! Come early to watch the Cow Chip tossing contest at 10:00, The Cutest Lil Chick Contest at 10:15 & the kids' Pre Parade at 11:30.  Main parade steps off at 12pm at Fourth and D St, loops around to Petaluma Blvd North, and ends at Petaluma Blvd South at D St.