Help me out, we are having an open bar that we are stocking ourselves. Full bar including cognacs, wines, etc. As a gift to me my nephew, a licensed and insured bartender, is offering his services to me. He is also bringing others along who are not charging either because they are depending on tips...Should my guest be prepared to tip and if so, how do I convey this to them? I switched my venue to one nearly 3x as much in order for us to serve alcohol. Any feedback is appreciated