The countdown has begun. Wait, no, the countdown is over, because the holiday season is totally upon us. So skip the Scroogism and spend the next six weeks embracing the city in all its cheesy, unironic, brightly lit holiday glory. Sure, that’s a lot of shopping, eating, drinking, caroling, and oohing and ahhing at decorations, but we know you have it in you. Here is everything you must do in Boston during the holiday season.