There is more than one artist with this name:
These are photos from concerts where petra played, so they may be of other bands that played the concert as well.
Sonshine '91 Jul 12 - 13, 1991 Willmar, Minnesota, United States Uploaded by Dvv
Cornerstone 1991 Jul 4 - 7, 1991 Bushnell, Illinois, United States Uploaded by Wileecoyote
Creation Festival 1991 Jun 26 - 29, 1991 Mount Union, Pennsylvania, United States Uploaded by Wileecoyote