Five things you need to know today, and the vaccine mandate reaction

Good morning, Boston. Here are the five things you need to know to start the shortest day of the year, plus holiday lights, law firm mergers, Good News Tuesday and reactions to Boston's vaccine mandate. Boston’s vaccine mandate Boston Mayor Michelle Wu announced yesterday that customers will need to show proof of Covid vaccination to eat inside restaurants, to exercise inside gyms and to visit entertainment venues such as arenas and concert halls. Scroll down for reactions from local restaurant…