Caterers always bring way more food than is needed to a buffet so that they will avoid the embarrassment of running out of food.They also will change out an item that is getting low so that nothing gets down to the last scrap which looks pretty bad if you are the last person through.
They have back ups all heated and ready to go if needed and if they are not,they go back with the caterer.
Remember.....you are paying per meal served,not all you can take home with you.
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