Maybe, but what you're describing doesn't seem like standard procedure. I'm not sure why you're being asked to sign a form from the band/venue management that allows them usage of your photos (apparently without compensation or a photo credit). Not if you're shooting for a publication, that seems like a conflict. If you're taking photos for a publication they should be contracting with you for compensation/payment and licensing usage of your images. They should be getting the credentials for you. That's where a request usually comes from, then goes through the PR person or media dept., etc., then is issued to the photographer (or reporter, writer, etc.). You probably need to get clarification.