is not MIC. That’s “mick.”
It’s MIKE. That’s “mike,” designed to sound something like the first syllable of the word.
Now, I realize that by all the rules of English pronunciation, the word should be pronounced MICK-ro-phone, or spelled mycrophone. But it’s not. So there.
If you’re advertising a performance of speech or song by anyone who wants to get up and do so, that’s OPEN MIKE NIGHT, not Open Mic Night. It could even be OPEN MIKE NITE. Just not MIC. MIC is nothing.
Please make a note of it.