One holiday that's overlooked also... Festivus lol
From Seinfeld:
Frank Costanza: "And at the Festivus dinner, you gather your family around, and tell them all the ways they have disappointed you over the past year!"
Frank Costanza: "The tradition of Festivus begins with the Airing of Grievances. I got a lot of problems with you people! And now, you're gonna hear about it. You, Kruger. My son tells me your company STINKS!"
George Costanza: "Oh, God."