Holiday Lights: Celebrate the lighting of Boston’s official Christmas tree [Video]

Holiday Lights, Boston’s annual holiday show and Christmas tree-lighting ceremony, will feature a star-studded lineup of performers headlined by American Authors and a visit from Santa. You can watch it on this page starting at 7 p.m. Boston’s official tree is an annual gift from Nova Scotia to the city to show appreciation for Boston’s help after the Halifax Explosion in 1917. They’ve sent a tree to Boston for more than five decades.On Dec. 6, 1917, two ships collided in Halifax Harbour, causing a devastating explosion that killed nearly 2,000 people and left hundreds more severely injured and homeless. Boston then dispatched a train full of supplies and emergency personnel within a day of the disaster.This year’s Tree for Boston, a white spruce, comes from the property of Hugh and Liz Ryan in Mattie Settlement in Antigonish County.