Gratuity for Caterer

I am getting married shortly and my fiancee and I are sorting out tips for our vendors. We are unsure how much of a gratuity to give our caterer. He does not own the catering company--he works for them at a specific location. All of our discussions and meetings have been with him. He signed our contract and will 'run the show' on the day of the wedding. We would appreciate any advice from someone who has been in this position. Is the gratuity a percentage of the catering bill or just any flat amount of cash? Thanks in advance for your help.

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Gratuity for Caterer

ALthough we're using a catering/banquet hall, the gratuity is part of the contranct (which is ironic, if you think about it)...anyway, we're OBLIGATED to pay 17% of the total pp price...which was pretty standard % from a discussion on this board a while back.