alright, I figured it out. Set up a gmail account for the barber. Set up a standard email request on his site. They click the button sending him the request. gmail is smart enough to recognize key words (like event) and tag them. Right click to add them to his calendar. gives him "approval" rights allows anyone to email a request for a specific time. shared calendar can limit everyone to free / busy to keep privacy clean.

good suggestion. I'm going to give it a go.