Petaluma’s long-storied heritage as a source of butter and eggs for the region will be celebrated once again this Saturday with a parade. Those not parading will line the streets and watch the paraders pass by. At a predetermined signal, paraders and parade watchers will switch places guaranteeing everyone a chance to strut their stuff. Thanks to our local constabulary, those wishing to view the festivities through lens of a beer glass will have to do so in three areas designated at Beer Gardens.