Hi, I am hosting a BBQ at my house for a large group (150 people). We hired a BBQ truck with a pit crew, including the owner, to cook the food. Guests will come to the BBQ area to pickup their food, the crew is not serving guests at tables. The cost includes food, a $750 fee for the crew, and travel. It does not add in a gratuity. Do I tip the pit crew and owner in addition to the bill? If so, how do I calculate the tip. I asked the BBQ company but they simply said it is up to the client. Any guidance you can offer is appreciated!