The Del McCoury Band will welcome Dailey & Vincent and Bobby Osborne to DelFest, the family's bluegrass festival that takes place May 27-30 in Cumberland, Md. The lineup also includes the Avett Brothers, the Gibson Brothers, David Grisman, Mountain Heart, Steep Canyon Rangers, Keller Williams & Friends and Yonder Mountain String Band. In addition, members of the Del McCoury Band and singer-songwriter-guitarist Ronnie Bowman will also take part in the DelFest Bluegrass Academy from May 25-27.