WESTPORT — Thousands of motorcyclists will muster Sunday at Sherwood Island State Park for a tribute to victims of the terrorist attacks on Sept. 11, 2001.

The CT United Ride, marking its 22nd year, is said to be the state’s largest 9/11 commemoration.

Motorcyclists will begin leaving the park about 11:30 a.m. Sunday. They’ll head south on Interstate 95 to Exit 17, Saugatuck Avenue, before heading north through town on Route 33.

The rest of the 60-mile route passes through Wilton, Redding, Bethel, Newtown, Monroe, Trumbull and Fairfield before ending at Seaside Park in Bridgeport.

Signups for the event still will be accepted at a pre-registration program Saturday, from 11 a.m. to 5:30 p.m., at Captain’s Cove Marina in Bridgeport, and from 8:30 to 10:30 a.m. at Sherwood Island. Fees are $30 for each rider and $30 per passenger.

Money raised by registration fees are donated to emergency relief funds for families of police officers and firefighters in the state and to two local United Ways, according to organizers.

The event usually has opening ceremonies. This year, it will additionally pay tribute to three first responders from Connecticut who died in the line of duty. They are Bristol Police Lt. Dustin DeMonte, Bristol Police Sgt. Alex Mamzy, and North Haven Firefighter Matthias Wirtz.

For more information, check the United Ride Facebook page.