The Second Atlanta Pop Festival. Photo: Dennis Eavenson

For many Georgians, the Second Atlanta International Pop Festival is unforgettable.

The concert, organized by promoter Alex Cooley, took place in Byron, Ga., on July 3-5, 1970. More than 30 acts performed during the three-day fest, including Jimi Hendrix and the Allman Brothers Band.

On Saturday, an official Georgia Historical Society marker will be unveiled at the site. Additionally, invite-only screenings of a feature-length documentary about the festival will take place in Macon and Atlanta on Saturday and Monday, respectively.

The film’s director, Steve Rash, said the 110-minute documentary is still a work in progress, but he wanted to “put the rumors to rest and show people some film.” The screenings will be followed by a Q&A session with Rash, who is looking for audience feedback.

The ceremony for the unveiling of the historical marker is free and open to the public. It takes place at 3 p.m. Saturday at the former festival site near the Middle Georgia Raceway – 4015 US Highway 41 North, in Byron.