MANCHESTER — — The Green Mountain Bluegrass and Roots Festival returned from a two-year COVID hiatus this weekend at Manchester’s Hunter Park, bringing nationally known string instrument artists to the Northshire. Saturday’s headliners, the “American Acoustic” tour, featured the Punch Brothers, Watchouse and Sarah Jarosz. Punch Brothers’ energetic singer and mandolin player Chris Thile served as master of ceremonies as all three artists played their own sets, then joined on stage for a set-ending jam. Performers including Twisted Pine, Leftover Salmon, Hawktail, Ric Robertson and Bella White serenaded patrons, many of whom camped overnight on the Hunter Park grounds