Is there an apostrophe in Grandparents Day?

No. Grandparents is the plural form of the word, meaning it is a day to celebrate for more than one grandparent. Grandparent's is the possessive form of the word, meaning the day would belong to a single grandparent.

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What letter replaces apostrophe in Hallowe'en?

None, Halloween is spelled Halloween

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Why is Hallowe'en spelled with an apostrophe?

It accents how it is pornounced, but "Halloween" is usually spelled without the apostrophe in it.

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