As Bay State residents and families turn out to observed Memorial day, honor the fall, and gather together, most government buildings and offices will be closed, but plenty of businesses will be open.

Memorial Day officially became a federal holiday in 1971, observed on the last Monday in May.

Gov. Maura Healey is due to attend a Memorial Day ceremony at the state-run Veterans Memorial Cemetery in Winchendon. She’ll be  joined there by Veterans Secretary Santiago for a ceremony that begins at 9 a.m..

Boston Mayor Michelle Wu is attending the Annual Memorial Day Service for Thomas J. Fitzgerald VFW Post 561. Proceedings there begin at 9:30 a.m. at the post located at  715 E 4th St, South Boston.

For city residents and visitors looking for a place to reflect on the holiday, more than 37,000 flags have been installed at the Soldiers and Sailors Monument on Boston Common by the Massachusetts Military Heroes Fund and Home Base. The installation is free to visit. Volunteers will begin to “retire” the flags at 5:30 Monday afternoon.

Banks and the stock market will also be closed. Many retailers will be open, though hours will vary by location.

If you’re heading home Monday night, be prepared for traffic. AAA is predicting that 38.4 million people will travel by car over the weekend — the highest number for the holiday since AAA began tracking it in 2000 — and that another 3.5 million people will travel by air.

Somerville’s Pack 3 Cub Scouts march in that city’s Memorial Day Parade Sunday. (Libby O’Neill/Boston Herald)
The Aleppo Drifters ride 3-wheeled trikes down Broadway during Somerville’s Memorial Day Parade Sunday. (Libby O’Neill/Boston Herald)
A Roberto Clemente 21 Dancer smiles while performing along Broadway Street during Somerville’s Memorial Day Parade. (Libby O’Neill/Boston Herald)