The Greyfox Bluegrass festival has revealed its 2018 lineup featuring The Del McCoury Band, Sam Bush Band, a 40th anniversary celebration of Hot Rize, Jerry Douglas, The Wood Brothers and more.The Dry Branch Fire Squad will act as the host band, and Billy Strings will be the artist-in-residence. The festival will take place from July 19-22 on the Walsh Farm in Oak Hill, NY.Weekend passes and…