I just experienced something new and am looking for advice on how to make sure it doesn't happen again. I was hired to photograph a quinceanera. It was for two girls, and it about a 150 guests, definitely manageable for two photographers. When the event starts, we realize that there is another photographer standing with the videographer. We knew that they had been looking for a videographer, but knew nothing about this other photographer. We spoke with one of the mother's (the one who hired us) and she said that another family member of the other girl hired the videographer, and the photographer "came with the package". Things got very stressful at times, as we were trying to be respectful of this other photographer, but at the same time making sure we do what we needed to do to. What's funny is that the family honestly thought they were helping us out by bringing in this other photographer, and we were blindsided since we knew nothing until it started. I'm pretty sure I've seen some event photography contracts that have a section that will explicitly state that, if hired, we will be the only professional photographers on site. So that might help if fully explained to the client. But what happens if another one is hired anyways, and I show up to another photographer at an event? I don't think that gives me the right to refuse to photograph, so what do you do?