Thu Dec 3, 6–8 p.m.; Commonwealth Avenue Mall lights about 8:15 p.m.
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Boston Common (Visitor Information Center)
Downtown / Boston Common
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Free
Boston lights the tree Nova Scotia sends each year in thanks for help after the 1917 Halifax explosion, with live performances. Free, 6–8 p.m.; the Comm Ave Mall lights follow.
Whosly keeps your city's festivals, concerts and happy hours in one place — star the dates you're into, see which friends are going, and make it a plan.