What makes Eliot's verses especially memorable is that while they deal with a religious holiday, they speak to a very secular concern: our struggle to hold on to our inborn capacity for wonder, that same essential faculty that fuels both science and spirituality.
Saturnalia was an ancient Roman festival in honour of the deity Saturn. The holiday was celebrated with a sacrifice at the Temple of Saturn and a public banquet, followed by private gift-giving. As the Roman Empire came under Christian rule, many of its customs were recast into or at least influenced the seasonal celebrations surrounding Christmas.
Rudolph's father, Santa's lead reindeer Donner, feels ashamed after Santa Claus tells him that he won't allow Rudolph to be in the sleigh team with his nose ("Jingle Jingle Jingle"). Donner uses a special cover to hide Rudolph's nose so he can send Rudolph to the Reindeer Games.