Food is prepared in advance and sometimes not stored properly. Also, you may serve the food buffet-style and it stands and stands as your guests come and go. People pick over the food. Later on, some may complain of diarrhea, vomiting and other problems. The answer may be food poisoning.
Bacteria cause food poisoning.
All they need to grow is the right combination of time and temperature. If you follow these simple rules you can avoid trouble. Arrange to have enough large serving dishes so that you can bring the cold food from the refrigerator or the hot food from the oven frequently and replace dishes on the table. Hasty washing often means that dishes and utensils are used when they are not properly cleaned. Figure how much refrigerator space you'll need to store foods.