Searsport Shores Campground, 216 West Main Street, will host a public concert and square dance on Friday, September 13, at 7 p.m., as the opening night of Strung Together: Bluegrass and Old Time Music Jam Festival, which will take place at the campground through Sunday, September 15. A $5 to $10 donation is suggested. The concert will feature old-time fiddling by Nate Paine and the Mudslingers followed by a square dance called by Pat Dancen with music by Strung Together House Band. For more information, call 548-6059.