Marchers step off at Lower Mills at 1 p.m.

Dorchester will celebrate its 380th anniversary this Sunday with a parade of floats, marching bands, and politicians that will transform its often-congested main thoroughfare into a rolling carnival for children of all ages. The Dorchester Day Parade starts at 1 p.m. from Lower Mills and follows its traditional route up Dorchester Avenue to Columbia Road.

This year’s march will feature several bands, including the Boston Police Gaelic Column, the Spartan’s Drum and Bugle Corps, and the Boston All-City Marching Band. An array of school and civic organizations, businesses and political figures — including all four candidates for Massachusetts governor— are scheduled to walk the route.

Ed Geary, Jr., a parade organizer, said that the all-volunteer committee has “been working tirelessly to put another extraordinary parade again on the streets.”

“I’d like to thank Karen and Ed Crowley for their many dedicated years of service,” Geary said. “They stepped down from the committee last year after the parade.”