Here are some ways to spell it out depending on the context:
* Formal: "Master of Ceremonies"
* Informal: "MC"
* Creative: "Emcee" (less common, but acceptable)
You can also use phrases like:
* "Your host for the evening"
* "Our event host"
* "The evening's MC"
Ultimately, the best way to spell it depends on the tone and formality of your event.