I'm Italian: every given day most of my fellow nationals are supposed to celebrate this or that saint... the Catholic Church is always more than happy to extend its cultural hegemony by attaching itself to celebrations of any sort, I'd be surprised if other confessions were very different on that front - there's always a scripture or an event that you can use to celebrate a specific day of the year. Even Christmas has not always fallen on the 25th day of the 12th month of the year, after all.

Any calendar reform unfortunately has to deal with this backward-compatibility nightmare with religious tradition, which doomed most previous attempts; hence my parent comment.