There was a time when John Denver, Jimmy Buffett, members of the Eagles and the Nitty Gritty Dirt Band all gathered in Snowmass to perform for thousands of people - and all for a good cause.The Deaf Camp Picnic, which Denver helped put on the map, ended after the popular singer's death in 1997. Now, after a 15-year hiatus, the event that supports the work of the Aspen Camp for the Deaf and Hard of Hearing is coming back July 19-20, 2013."It was a great, big community event," said Mike Adler, a camp executive committee member. "There's been a lull. We're going to pick it up where it left off."The Nitty Gritty Dirt Band will return to headline the picnic. There will be two days of music, starting with a free performance of cover songs by Mack Bailey and former Denver bandmates Chris Nole and Pete Huttlinger, who play together in the John Denver Tribute Band, on Friday night in Base Village. Rich Ganson also will perform some songs for kids on Friday.All proceeds of the picnic benefit the camp, which has been providing services to the deaf and hard-of-hearing since 1967. Proceeds not only will help camp operations but also provide scholarships and aid to many participants. About two-thirds of campers ask for full scholarships to cover their tuition.