I checked the festival site too . . their schedule still has GPN in the 2:30 - 3:30 slot
The reason I suspect they are recording the set live but broadcasting it later is because they've done it quite a few times before when I've watched their festival coverage. 

Maybe can test the theory today . . Davy Knowles &amp; Back Door Slam's is listed as 4:45 pm on iClips  . . and 12:30-1:30 pm on Hangout's.