By the way there will be some music happening outside the GPN fest area too. 
http://www.lcmfestival.com/event-information/daily-schedules/  
suggestions to catch on that stage would be :
Amida Bourbon Project <i>(Aya Inoue &amp; Matt Harpster)</i> :  Saturday, August 13, 11:00-1:00pm 
Lisa-Marie Fischer : Saturday, August 13, 6:15-7:30pm 
Joshua Panda Band : Sunday, August 14, 11:00-2:30pm