Does anybody know why there are no flights on Christmas eve with Ryanair?

I've been checking every couple days for a few months now and people said maybe wait until you are exactly 6 months from your return date, check their FAQ's, Email them etc etc I have and still no luck! My flight back on the 27th is up so its not the wait till 6 months exactly its just saying there's no flights on Christmas eve, Christmas day (obv) and boxing day! Does anyone know if they will be putting up flights for Christmas eve or if they are just not flying that day this year?