What special holiday event is occurring at the hotel in "Holiday Inn"?

Holiday themed shows

What Marvel superhero is T'Challa's sister in "Black Panther"? Which animal female is typically larger and stronger than the male, often consuming him after mating? What yellow citrus fruit is sour to taste? What is the imaginary line dividing Earth horizontally into Northern and Southern hemispheres? Which planet is known for a prominent hexagonal storm at its pole?