How can i draw on a canvas and make that a finished product?

I have to enter a canvas for a charity event and i don’t want to paint on it (that will just mess it up) so can just use a 4B pencil, sketch something on it and then fixitive it? Does that count as a finished product? How do you make a pencil drawing into a finished artwork? Should i do anything to the canvas beforehand/afterward?

Does it have to be on a canvas? If not you could use stiff bristol board or paper, spray it , then frame it.
Have fun with it,
Jeff