Hey everyone ~ got a question for you. So I just made my appointment for our food tasting. We're allowed to come as a party of 6, so we're both bringing our parents. The guy at our venue said everything is 100% free except they'd appreciate if we'd tip the server. That's totally fine, I'm just not sure what an appropriate tip would be. What do you guys think? 20% of the bill? Except that we won't get a bill. Should I ask what the cost of everything would be if it was not free? Just want to make sure we don't offend our server 
Thanks!!