Here are the latest Charlestown - Navy Yard neighborhood notes:

Bunker Hill history

Boston National Historical Parks will lead free guided tours called “Decisive Day” every half hour from 9:30 a.m. to 4 p.m. on Saturday, Sunday and Monday, Sept. 2-4 at the Bunker Hill Monument.

Two months after the battles at Lexington and Concord, a battle raged on the Charlestown peninsula. Visitors will discover why this battle, a victory for the British and a loss for the colonists, was an important step in the colonists’ fight to drive the British army out of Boston.

For more information, call the visitors’ center at 617-242-5601 or go online to www.nps.gov/boston.

Weekend fun

The USS Constitution Museum, 88 Constitution Road, will host a Labor Day weekend family program, “All Hands to Mischief,” from 9 a.m. to 6 p.m. on Saturday through Monday, Sept. 2-4.

Families can learn how sailors spent their time between chores and battle with activities such as writing letters home (with quill pens), playing colonial board games and getting (temporary) tattoos, as well as visit the hands-on and interactive exhibits.

Admission is free. Visit www.ussconstitutionmuseum.org or call 617-426-1812 for more details.

Muskets, men and liberty

Boston National Historical Parks will lead free guided tours “Of Muskets, Men and Liberty” at 11:30 a.m. and 12:30, 2:30 and 3:30 p.m. on Saturday, Sept. 2 at the Bunker Hill Monument.

Visitors will discover why three men from very different backgrounds were fighting for a common cause because of their shared desire for liberty.

For more information, call the visitors’ center at 617-242-5601 or go online to www.nps.gov/boston.

History of the Seabees

The USS Constitution Museum, 88 Constitution Road, will welcome Joseph Gallo in a one-man show on the history of the Seabees at noon and 3 p.m. on Saturday and Sunday, Sept. 9 and 10.

The show is an engaging narrative of the Seabee experience through time. Playwright Gallo breathes life into the legacy, as audiences have the unique opportunity to hear “first-hand” the reflections of the men and women who selflessly answer the call to action in both war and in peace.

The performances are part of the Seabee Diamond Anniversary Campaign.

Admission is free. Visit www.ussconstitutionmuseum.org or call 617-426-1812 for more details.

Art in the park

The 20th annual Art in the Park celebration will take place from 10 a.m. to 5:30 p.m. on Saturday, Sept. 9 at City Square Park, Chelsea Street. The rain date is Sunday, Sept. 10.

More than 60 artists and artisans will display paintings, sculptures, prints, decorative art and pottery in this juried event. Artists will be present to meet and greet visitors during the daylong celebration. New this year is a painting tent. The community is invited to enjoy art, live music, lots of food and fun.

The Artists’ Group of Charlestown and the Friends of City Square Park are sponsoring this program.

Call 617-241-0130 or visit www.artistsgroupofcharlestown.com for more information

Choose to be healthy

The Charlestown Branch Library, 179 Main St., will host “Be Choosy, Be Healthy” from 10 a.m. to noon on Friday, Sept. 15.

Children can join students from Massachusetts General Hospital Institute of Health Professions for activities and story time. Healthy eating will be the focus.

Admission is free. Call 617-242-1248 for further details.

‘Old Ironsides’ tours

The USS Constitution, the oldest commissioned warship afloat, is open for tours from 10 a.m. to 6 p.m. on Tuesdays through Sundays, now through Sept. 30.

The tours will be narrated by one of the Constitution’s active-duty sailors and consist of four stations through the ship’s top three decks.

One of the programs available is the “Constitution Experience,” where participants can watch the morning colors ceremony from Pier One and then board the vessel for a tour and subsequent visit to the nearby museum.

Reservations are required for this program, which is held at Pier One at 7:40 a.m. Groups are limited to 50.

For more information, visit www.history.navy.mil/ussconstitution or call 617-242-7511.

Marine museum

The Boston Marine Society at Building No. 32, Charlestown Navy Yard, is open to the public from 9 a.m. to 4 p.m. on Mondays through Fridays.

The society hosts a large collection of art and artifacts depicting maritime history and life on the sea, as well as a research library, detailing the history of sailing and marine commerce and the history of one of the oldest and most important ports in the country.

Its website includes selected objects from its collection and the history of the organization. Visit www.bostonmarinesociety.org or call 617-242-0522 for more information.

Diorama display

The Bunker Hill Monument Museum, 45 Monument Square, is open daily from 9 a.m. to 5 p.m. Located on the Freedom Trail, the museum displays the history of the construction of the Bunker Hill Monument as well as a diorama of the historic battle. A cyclorama shows a 360-degree view of the battlefield.

The Charlestown Historical Society keeps its archives in this building, which once served as the neighborhood’s public library.