Welcome to English Forums! a and an only go with singular nouns. You can't have *a holiday s , *a cat s , *a good guy s , *an interesting book s .
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Hi,
You could also say
Sarah wishes everyone a happy holiday.
Best wishes, Clive
Hi.
Consider these facts.
Christmas is a holiday.
Happy Holidays" is a phrase we commonly say to people during the Christmas period.
With careful grammar, the following sentences are correct.
Sarah wishes everyone a happy holiday!
Sarah wishes everyone "Happy Holidays!"