Tailgating is illegal in Scotland. It’s not in South Bend, and Celtic F.C. supporters who made the trip took full advantage. Green-and-white striped kits dominated the parking lots around Notre Dame Stadium, as the Scottish club prepared to play a friendly match on Saturday against England’s Chelsea F.C. The people wearing them went home happy, both from the experience and Celtic’s 4-1 victory. “We don’t get anything like this in Scotland, so it’s nice to experience it,” Joseph Campbell, a 21-year-old Celtic fan from Glasgow, Scotland, told Blue & Gold outside the stadium. Celtic fans gathered…