For its twentieth anniversary, a restaurant organizes a "neighborhood cookout" style event in their parking lot. Near the end of the event, they wheel out a large cake and give every partygoer a coupon for 20 percent off their next meal. This is an example of .

ceremony

Explanation: ceremony simply means a formal public occasion, especially one celebrating a particular event, achievement, or anniversary. Furthermore, ceremony is a formal event that occurs as a result of a special occasion or to commemorate something, or a special series of acts performed in an established or set manner. An example of ceremony is when a restaurant organizes for its twentieth anniversary, "neighborhood cookout" style event in their parking lot. Near the end of the event, they wheel out a large cake and give every partygoer a coupon for 20 percent off their next meal.

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