A new film documenting the 50th anniversary trip taken on the legendary Furthur bus last summer by spearheaded by the son of late author and activist Ken Kesey will make its world premiere in San Francisco. The journey made in the summer of 2015 was the longest tour made on Futhur, totaling more than 15,000 miles during the 75 day adventure.

In conjunction with San Francisco DocFest, Going Furthur will be screened at the Roxie Theatre on Saturday, June 4. The film documents the trip taken by Zane Kesey who recruited a new cast of Pranksters to tour the country while attending music festivals, tribal gatherings and other community events along with several additional stops along the way. It was embarked upon to to mark the 50th anniversary of the elder Kesey and the Merry Pranksters’ maiden voyage on the psychedelic school bus called Furthur in 1965.

The film features Zane Kesey, as well as original Pranksters such as Ken Babbs, George Walker, Wavy Gravy and many others. It will also be screened as part of DocFest on June 9 at the Roxie and on June 10 at the Vogue Theater and will head east for the East Coast premiere which will take place at the electronic music festival Mysterland on June 11 – 13 in Bethel Woods, New York. The Maui Film Festival will also show Going Furthur during the event held June 15 – 19 in Hawaii.

Head here for more information and watch the trailer for Going Furthur below: