Britt Festivals has announced the addition of two shows to this summer's concert lineup.

Britt Festivals has announced the addition of two shows to this summer's concert lineup.

Folk rock singer-songwriter Brandi Carlile will perform Aug. 31, and Michael Franti, already scheduled for an evening performance on Aug. 21, will add a children's matinee.

Carlile has toured continually since the release of her debut album in 2005, visiting the Britt hillside in 2007 and 2010. Tickets to this year's show cost $34 for lawn seats and $45 for reserved seats for adults. Children's tickets cost $23.

Michael Franti & Friends will perform a family show at 2 p.m. Aug. 21, prior to his evening show with his band Spearhead. Gates for the afternoon show will open at 12:30 p.m. Tickets cost $14.50 per person, and are free for children 2 and under.

The Franti children's concert is the third children's concert booked for the 2012 season, Britt officials said. Patrons can buy a family concert package that included admission to each of those shows for $27.50 per person, which offers a $2 discount per concert.

Tickets for both added concerts will be available to members Tuesday, May 1. General public sales for all Britt concerts begin Thursday, May 17.