Step 1: Understanding the Concept:
The question asks to identify which of the options is a clear example of an "entertainment event." An entertainment event is primarily organized for the amusement and enjoyment of an audience.
Step 2: Detailed Explanation:
(1) Celebrity night: This is an event specifically designed to provide entertainment through performances, appearances, and interactions with celebrities. Its main purpose is amusement. This fits the definition perfectly.
(2) Graduation day: This is a formal ceremony or a convocation marking an academic achievement. Its primary purpose is celebratory and ceremonial, not entertainment.
(3) MICE: This is an acronym for Meetings, Incentives, Conferences, and Exhibitions. It refers to a type of tourism and event management focused on business, professional, and educational purposes. It is not an entertainment event itself but a category of business events.
(4) Birthday party: This is a private social gathering to celebrate an individual's birthday. While it can be entertaining for the guests, it is classified as a personal or social event rather than a public "entertainment event" in the context of the event management industry.
Comparing the options, a celebrity night is the most fitting example of an event whose sole purpose is public entertainment.
Step 3: Final Answer:
A celebrity night is the best example of an entertainment event among the choices.