Boston Mayor Marty Walsh announced Thursday that the city will officially recognize April 15, the anniversary of the Boston Marathon bombings, as "One Boston Day."
Walsh said the new tradition will honor the city's strength during and after the 2013 attacks, which killed three people and injured at least 260 others.
The mayor made his announcement during the unveiling of this year's marathon street banners on Boylston Street.
Walsh said the idea for a commemorative day on April 15 was born out of meetings between survivors, marathon organizers and members of the One Fund, the charity for bombing victims.
"I think it's a way to properly remember the day by doing nice things for people, just like what happened here in the city the day after the bombing," Walsh said at the unveiling.
2014 Boston Marathon winner and Olympic silver medalist Meb Keflezighi and four-time Boston Marathon winner Bill Rodgers helped reveal the banner designs, which are themed "There's Only One Boston" and feature images of runners, volunteers and fans of the race.
Roughly 500 banners will be hung around the city ahead of the April 20 race.
It was also announced at Thursday's event that for every social media post about the marathon using the hashtag #WeRunTogether, John Hancock — a longtime key sponsor of the race — will donate $1 to the Boys & Girls Club of Boston, up to $26,200.