Tickets go on sale Friday (Sept. 15) for Tim McGraw’s 11th annual Swampstock celebrity concert and softball challenge. Faith Hill, Martina McBride and Hot Apple Pie will also appear during the Oct. 7 event at the Tim McGraw Sports Complex in Rayville, La. Advance tickets, priced at $30, are available at McGraw’s official Web site and Ticketmaster outlets. Tickets will be $35 at the gate. Proceeds from the event will benefit McGraw’s nonprofit Neighbor’s Keeper Foundation.