June 27
Yes, but in this case it's not a plural use. It's a possessive. You need to add an apostrophe to show ownership of the birthday. It's Kim's birthday, the birthday of Kim. Just write: In honor of Kim's birthday. The word Kim's is not plural here, but it is correct with the possessive.
June 15, 1969 is Kim's birthday. Kims sign is genimi.
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