They have not annouced it yet... My guess would be some of these bands since they are playing at Edgefest 21 in Toronto.
Rodney Atkins and little big town pretty sure
The Remedy - Jagged Edge album - was created on 2011-06-21.
Sasktel Saskatchewan Jazz Fest was created in 1989.
Muzos
Yes, but is up to you how you sneak it in.
i think they came at the edge fest.
ENRIQUE!!!!!
Jezzy
SuperGals - 2001 Certain Victory Go Go Sports Fest 1-21 was released on: USA: October 2010
I believe the legal age is 21, although I'm not sure.
Chiller Cinema - 1999 Nashville Horror-Fest 03 Part 1 5-21 was released on: USA: 17 October 2003
Rodney Atkins and little big town pretty sure
Official Best of Fest - 2010 Turn Cold 1-17 was released on: USA: 21 May 2011
first its 22 and edge won
The Tenderiser - 2006 was released on: USA: 21 September 2006 (Fantastic Fest)
Dialogue - 2012 was released on: USA: 21 September 2012 (Fantastic Fest)
Official Best of Fest - 2010 Luka The End Is Night The Unique Oneness of Christian Savage 1-21 was released on: USA: 23 July 2011