Yes, that is something I can relate to -- religion being used in politics and government, especially.
Most of the holidays and celebrations where I'm from specifically are religion based, but there are others that follow the calendar year. Zenith is the start of summer and Harvest's Close is the start of autumn, for example; both usually have festivals with feasts, games, that sort of thing. We also have Barren Eve, which is always observed during the longest night of winter and is to honor those who have been lost in war. It's less jovial than the others.
There are also some elven holidays, but they're generally based in gods that my people don't generally worship. Drow are also a bit removed from the other elves for various reasons, so I don't know if we would celebrate them even if we didn't have the Luxon to distract.