Hello gina bartley;
Does your cell phone have a camera (and USB connectivity)? Or a point & shoot digital camera?
That might end up being a better option than carrying around a laptop and a webcam in your arms. That says 'awkward' to me but it could work.
Trying to use a laptop as a camera is not ideal. I'm curious as to how you would use the laptop as a fundraiser.
Any photos you took with it would not be of markatable quality. I wouldn't pay money for a photo taken with a webcam.
It's much better to use a stand alone digital camera, even the basic ones have a higher resolution. If it comes to that chances are your mobile phone has higher resolution.