The Idaho Botanical Garden's Outlaw Field Summer Concert Series just got a little longer with the addition of a Sept. 22 show featuring Michael Franti and Spearhead. Tickets are $35-45 and go on sale at 10 a.m. July 10 through TicketWeb.

Other shows in the series include:

• Reckless Kelly, 4 p.m. Friday; tickets $25 in advance through TicketWeb.
• Indigo Girls and David Ryan Harris, 7 p.m. July 27; tickets $25-35 through TicketWeb.
• Lyle Lovett and his Large Band, 7 p.m. July 29; tickets $35 and $50 through TicketWeb.
• Bonnie Raitt and Taj Mahal, 7 p.m. Sept. 2; tickets $50 and $75 through TicketWeb.