A free viewing of the PBS special of Bluegrass Underground Season 6 will be offered this Saturday, Sept. 10, at Park Theater to the first 300 people who pick up tickets.“This is absolutely free,” said Warren County Chamber of Commerce president Mandy Eller. “Space is limited though. You can pick up tickets here at the Chamber or at Park Theater.”Doors open to the public at 6:45 p.m. and the show begins at approximately 7:15 p.m. There will be a VIP reception at 6 p.m. that is by invitation only.“The VIP reception is for people who made this possible, such as city of McMinnville officials, who have generously underwritten the production every year from the beginning, the owners of Cumberland Caverns, the filming crew, and of course the film’s producers Todd Squared – Todd Jarrell and Todd Mayo,” said Eller.Park Theater-goers on Saturday night will be presented with a special viewing of the Season 6 premiere featuring the Dave Rawlings Machine, which includes Gillian Welch.