DURING OR ON

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During/On Christmas/Easter/Thanksgiving Day people usually do ... Both are possible; 'on' is the usual.
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Thank you.

This is off-topic but I am not too sure about the use of an adjective to refer to a noun.

You wrote:

During/On Christmas/Easter/Thanksgiving Day people usually do ... Both are possible; 'on' is the usual.

I think it might have been unintentional but possibly intentional but you used the words 'the usual' to say something

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My usage is impeccable. Many adjectives can convert to pronouns, and they may refer to singular or plural nouns.

(At the bar) Patron: Gimme the usual, Joe. [NB: This is Joe the Bartender, not Joe the Plumber.]
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Thank you, again.

You said:

My usage is impeccable. Many adjectives can convert to pronouns, and they may refer to singular or plural nouns.

Yes, that is what I expect of you: impeccable (perfect?) user of English. Can you give me simple use examples of adjective being used as pronouns?

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'On' is the usual.
Gimme the usual, Joe.
The rich get rich and the poor get poorer.
The Good, the Bad, and the Ugly ( Il Buono, il Brutto, il Cattivo).
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