Bay Chamber Concerts’ second annual Summer Festival, four-plus days of special concerts and events overlaid on the regular Summer Series, will open Wednesday, Aug. 13, at noon with Chamber Music Everywhere, featuring busking-style performances on the streets of Camden and Rockport, as well as open rehearsals in festival venues.

The gala opening concert at 6 p.m. at the Rockport Opera House, 6 Central St., offers violinists Geoff Nuttall, Livia Sohn and Debra Fong; violist Margaret Dyer; cellist Christopher Costanza; the Parker Quartet; double bassist Kris Saebo, oboist James Austin Smith; and clarinetist Alicia Lee perform works by Elgar, Martinu and Bruch. Tickets are $45, $10 younger than 21.

At 9 p.m. Wednesday, an intimate Lieder and Art Song performance by soprano Martha Guth and baritone Tyler Duncan, with pianist Erica Switzer, will be presented at Union Hall, 18 Central St. tickets are $25, general admission.

Thursday through Sunday, Aug. 14 through 17, the Summer Festival will start each day with Bach for Breakfast at Pascal Hall, the renovated and repurposed church at 86 Pascal Ave., At 10 a.m. each day, Lawrence String Quartet cellist Christopher Costanza will perform from the unaccompanied cello suites of Johann Sebastian Bach. Coffee and pastries will be on sale prior to the performances. Tickets are $25, $10 younger than 21. On view will be “Poetics,” an exhibition of more than 40 drawings by artist Mary Barnes.

There will be Summer Festival performances morning, noon and night Thursday through Sunday; for more information, visit