“The Goonies” is a go.

Lawrence city commissioners on Tuesday night unanimously agreed to shut down a portion of Massachusetts Street for about seven hours on Sept. 26 to accommodate a free outdoor showing of “The Goonies,” a 1985 cult classic about a group of kids on a wild treasure hunt.

The movie is part of an event celebrating the Granada’s 20th anniversary as a live music venue and its 80th anniversary as a major entertainment venue downtown. The event will close the 1000 block of Massachusetts Street from 4 p.m. to 11 p.m. on Sept. 26. Crews will set up a portable screen and projector at the south end of the block, and movie-goers can bring their own lawn chairs and blankets to sit in the street. The movie is scheduled to begin about 9 p.m., although other festivities outside the Granada, 1020 Massachusetts St., will begin at 7 p.m.

Commissioners in the past have balked at the idea of closing down portions of Massachusetts Street, but the request won unanimous approval after commissioners said they thought it would be a unique family-friendly event that exposes more people to downtown. Several merchants also wrote letters of support for the temporary street closure.

Commissioners, however, said they do want to look at creating a policy to deal with future requests to close downtown streets for events.