Every Father’s Day, Santa Rosa’s Juilliard Park fills with more than 300 restored cars, hot rods, rat rods, and low riders for a free show run by an all-volunteer contractors’ association for close to three decades. This year, seven-year-old Ripley Hansen led his dad Tor through the rows, and dad admitted he was the one learning. From trophies for Best Flames and Best Rat Rod to why a modest entry fee and free admission keep the rows growing, read on to see what makes this Sonoma County tradition work.