Today is the deadline.
As I vented in the past, my dad only commented when I asked him directly if he would be working for Christmas/NYE - he said yes that he's be working through both holidays. I was holding out hope that he would be taking the 30th off and making a quick trip down here but it's not looking good. He never commented on the invitation at all.
When my grandma received her invitation she commented that it was cute. That is all.
I highly doubt that either of them are planning on coming to the party but it would be nice to be told.