Is New Year's Day the closest thing to a Universal Holiday that Earth has?

I know the calendar is arbitrary. It might make more sense for New Years Day to fall on the average date of the Winter Solstice, or Summer Solstice for that matter. But a great deal of the world does use the Gregorian calenda most Western nations observe. Does this make New Year’s Eve the most widely celebrated event on Earth?

Whatever the case, Happy New Years, all you Flutherites.