You'll have to point out one of these games for us... I haven't come across any so far! And that's from doing *slightly* more research than just using the site search. =]
As for Christmas games, there might just be enough for their own separate tag... and if not, you could gather up all the Halloween games and create a "holiday" tag! But of course adding one more tag would throw off the balance of the grid design in the "More" dropdown menu... =P
Someone should make one where you have to keep on opening bottles of bubbly to appease the thirst of all your guests. Watch out though! You don't want to shoot the cork into your eyes or those of your guests!