I found this list of UNOFFICIAL Nickelback summer dates on a Nickelback forum (http://www.nickelback-forum.com/announcement.php?f=9)

If they are still touring with Bon Jovi in the summer, these dates are interesting, especially the last one.

UNOFFICIAL Nickelback summer dates:

8 July 2006
Yankee Stadium
New York, NY

13 July 2006
Parc Jean Drapeau
Montreal, QC

15 July 2006
Shea Stadium
New York, NY

18 July 2006
Citizens Bank Ballpark
Philadelphia, PA

22 July 2006
CominskyPark
Chicago, IL

27 July 2006
Gillete Stadium
Foxboro, MA

29 July 2006
Giants Stadium
East Rutherford, NJ