Del McCoury hosted his annual DelFest in Cumberland, MD this past weekend. As in years past, both McCoury and his sons Ronnie and Robbie—mandolin and banjo, respectively—sat in with a number of acts throughout the family friendly event.

The collaborations started on Thursday night after Del McCoury Band’s set. Both Del and Ronnie joined Leftover Salmon for “Midnight Blues,” while Ronnie stayed on for “Home Cookin’” and “What a Cold Southern Night.” The Del McCoury Band’s fiddle maestro, Jason Carter, also sat in for most of the set. It all hinted at a weekend filled with familiar faces and Del’s unmistakable high mountain wail of a voice.

As previously reported, another highlight occurred during Trey Anastasio Band’s show on Friday night. Anastasio told the audience that The Del McCoury band’s Blue Side of Town served as Phish’s road music in the ‘90s when Aquarium Rescue Unit turned them on to the band. Anastasio dreamed of meeting Del, and as Del joked, they invited him out to their “small festival in Oswego” to play for over 65,000 people. Then, members of Del McCoury Band sat in for two songs, “I’m Blue, I’m Lonesome” and “Beauty of My Dreams.” Later in the night, Ronnie McCoury, Jason Carter and Rob McCoury returned for Trey Anastasio Band’s encores of “Heavy Things” and Led Zeppelin’s “Black Dog.”

On Saturday, Jason Carter and Ronnie joined Keller Williams and More Than a Little for a cover of Cage the Elephant’s “No Rest for the Wicked” and “Freaker by the Speaker.” Later that night, Del, Ronnie, Robbie and Jason took to the stage with the Old Crow Medicine Show for “My Love Will Not Change” and Ronnie sat in with the Infamous Stringdusters for “Pioneers” and “Wheel Hoss.” Greensky Bluegrass’ Anders Beck also provided some double-dobro action with Infamous Stringdusters on “Head Over Heels.”

Sunday was a day of Grateful Dead covers, with the Yonder Mountain String Band’s Jeff Austin sitting in with Larry Keel and the Natural Bridge for “Ramble on Rose,” and the Travelin’ McCoury’s with Keller Williams playing “Candyman.” Later, Del McCoury joined Yonder that night for the “oldest country song,” “Prisoner’s Song,” and Jimmy Martin’s bluegrass classic and crowd pleaser “Hit Parade of Love.” Ronnie and Jason took to the stage a couple songs later and stayed until the end, playing through “You’re No Good,” John Hartford’s “Holdin,’” a much anticipated “Rag Doll,” “Traffic Jam,” and the encore, the traditional “Red Rocking Chair.”