You can hand your server a tip personally. If you have cash.
They will give you a thank you for coming card, and they won't charge you for the tips.
Tip is not included on the bill. So yes, you'll be given a card at the end of the show. They used to suggest $20 tip but now they've changed the wording on the card and have removed the suggested amount. The tip, you leave it on the card n trade just like at any other restaurant.
They give you a little thank-you card in the end just like medieval times and you put your tip in the card and they come pick it up if you don't want to give it to him personally or you might think is too little
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