The populations of Burlington and Lowell will more than double when both towns celebrate the Fourth of July holiday this weekend, festival organizers said Thursday.

“It’s the one big event that we do every year and one of the only ones in the area that do a Fourth of July celebration,” said Diane Champion, a member of Burlington-Lowell Fourth of July Committee.

Building on the success of last year’s celebrations, more than 2,000 people are expected to attend, said Doug Wakefield, a committee member.

Lowell has a population of 291 people and Burlington had 384 as of the last census.

“It’s tradition, I think, really. A lot of people seem to schedule it so they can come back to the area and visit with family,” Wakefield said Thursday.

The event actually has three parades, Wakefield said. The main parade will start at 10 a.m. Sunday. Its theme: “Burlington-Lowell 4th of July: A Family Tradition.” People with floats, bicycles and walkers are encouraged to participate.

Organizers are also looking for clowns, antique cars, trucks, all-terrain vehicles and singers to participate in the parade.

The Children’s Parade will take place at 9:30 a.m. Anyone interested in joining it should call April Shorey at 732-4568.

Both parades will run along Long Ridge Road through Burlington, Wakefield said.

The third parade, the Memorial Tractor-ATV Parade in honor of Phillip Harding, will start at 5:30 p.m. Saturday, after a full day of events that start at noon with tractor games, including a chain pull and egg race.

The memorial parade will run from Hayden Lane to Phillips Field back to Hayden Lane in Burlington, Wakefield said. Anyone interested in participating in the parade with a tractor or ATV can call Wakefield at 356-2237.

A millwright at Lincoln Paper and Tissue LLC, Harding died last year, Wakefield said.

Music, breakfasts and suppers, and 4-H displays are also part of the event.