McMinnville officials were treated to a special screening of season three of “Bluegrass Underground” on Monday night as a thank you for the city’s $60,000 investment.The TV show that airs on PBS is filmed at Cumberland Caverns and attracts visitors throughout the nation. Season three features Old Crow Medicine Show, The Infamous Stringdusters, Andrew Bird and nine other acts.“We continue to gain momentum,” said show producer Todd Jarrell. “The Associated Press recently wrote a story about us that was published in nearly 200 newspapers.