If you truly want to change the world - then reflect the beautiful relationship of the Trinity to each person. I don't care if that person is gay, Muslim, atheist, blonde, foreign, black, redheaded, funny or not funny. To everyone say - Jesus lives inside of me, and Jesus is home for everyone; therefore I am home for everyone.
Rather than attempting to learn about all of the various holidays one might encounter, I recommend instead cultivating practices and postures that will allow us to encounter and navigate difference openly, gracefully and with a spirit of positive intention. I've gathered five practices that are helpful for navigating holidays and cultural difference.