Excel help needed:

I’ve put together a school year calendar in Excel, and I need a specific date in a given month to display as the letter "P" (for holiday), while keeping all other dates exactly as they are. For instance, if October 8th is a holiday, I want it to show up as "P" when entered, but leave everything else untouched.
I'm trying to use an IF function, but how do I structure the formula so that if the condition isn't met, it doesn't change anything?

Look, if that thing works for you, then it works for both sides of the argument, period.

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