Hudson Opera House presents the 15th Annual Winter Walk on Saturday, kicking off the holiday season in Hudson at 4:30 p.m., when Warren Street is made pedestrian-only. At 5 p.m., the Coxsackie-Athens Community Band begins the Santa Parade announce the arrival of Mr. and Mrs. Claus and the official holiday season begins. Look for Frosty the Snowman on the street, as well as Marley’s Ghost and Scrooge, the walking Grandfather Clock, the Tin Soldier, and a host of angels, snowflakes and elves of all sizes.