Even if a company calls it a “holiday party” it is still a Christmas party. The naming semantics the company chooses doesn’t determine whether it’s a Christmas party or not. If your company suddenly threw out the invitations and reprinted them with it saying holiday party instead of saying Christmas party, that doesn’t change the metzius of what it is just because they gave it a new name on the invitations.
Teire Yidden! Our zeidas and bubbes were killed Al Kiddush Hashem during the Christmas “season” by these mobs of goyim coming back from Mass, having been incited to murder by their priests accusing us of deicide. How can any of us go to a party celebrating this black day, regardless of what your employer names it?!?