I am going to write down two sentences below.
- On (the) event day, we will have photos taken together.
- On (the) celebration day, we will have photos taken together.
Do I need the definite article the in my sentences?
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I don't think I'd say "the event day" or "the celebration day". Rather, I'd say "the day of the event" or "the day of the celebration".
If the day has a name, you don't need the article: "On Labor Day, we will have photos taken together." So if you name the day after the celebration, you could say "On Celebration Day, we will have photos taken together." But if it's just the day on which a celebration is occurring, use "the": "On the day of the celebration, we will have photos taken together."
More usually it is said
on the day of the event
on the day of the party on the day of the wedding
on the day of the celebration
on the wedding day
has a slightly different feel than
on the day of the wedding
and the former usually has a possessive attached to it "their wedding day", "her wedding day", the latter nicely makes a distinction between "the wedding" (ceremony) and the "day" of the ceremony.
When the context is know, many Brits will simply say
on the day
on the day we will all meet in the pub beforehand