April 15 is known as “One Boston Day” thanks to a proclamation Mayor Marty Walsh signed last year. One Boston Day is a day on which Boston honors the anniversary of the 2013 Marathon bombings by encouraging “random acts of kindness and spreading goodwill.”
“April 15 is a date that has come to stand for our city’s deepest values, and we continue to be amazed by the spirit of the day, in the City, and around the world,’’ Walsh previously said.