How much do you give as a gratuity for your event?  Where we're looking they already charge a 20% service fee on total food and bar sales but the fine print says this is not a gratuity and you're welcome to include one, however, it's not a requirement.  Is it really not a requirement?
I'm thinking an additional 20% on top of everything else adds $$$$$.  So how do you figure this out?  Just food and beverage before added fees and taxes?  Or do I take their "not a requirement" to heart?  I'd hate to feel like I'm stiffing someone.
HELP!