I want to write the following:
This is due to the dramaticness of the day.
What other word can I use?
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The root word drama fits: "This is due to the drama of the day."
3 a : a state, situation, or series of events involving interesting or intense conflict of forces
b : dramatic state, effect, or quality - the drama of the courtroom proceedings - M-W
It isn't in any official dictionary, though it does appear on community dictionaries like Urban Dictionary and Wordnik.
Merriam-Webster offers dramatism as the appropriate word to mean dramatic manner or form.
If you're trying to describe how people would overreact, then "melodrama", "histrionics", "theatricality" or even dramatics might be close, instead of "drama". Which one you use depends on the context around your line - if you're referring to a society or large group of people, the above words fit better. If you're describing a situation between a few people, "drama" fits perfectly.
Also check out this SE question: Is there a single word for a person who overreacts?