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SUBMIT YOUR IDEAI got a different set of countries because I consider New Year's Eve holidays to be part of the New Year's celebration.
Nice challenge
My solution - haven't looked at the others but I'd guess that mine is pretty similar to most of them!
Solution attached. For #1, I initially interpreted it as looking for any country with 2 unique days for New Year - which includes 1) A country with New Year's Eve and New Year's Day, since they're both New Year related and 2) A country with 2 days throughout the year (like China). I think the phrasing of the question is a little ambiguous :)