A couple of suggestions for holiday weekend themed webcomics: When Old Nick steals Saint Nick's job, the fate of the world is at stake and it's up to Little Timmy Smithers to save christmas…if he can. Read Adam White's and Matt Black's Feliz Navidamned!
And the classic Saturnalia by Patrick Farley which is about “paganism, christmas, yule, winter solstice, horned god” and is NSFW.
Post your suggestions in the comments. Happy holidays to all.