It's not a public holiday nor is it a religious holiday
It's pretty close to Shrove Tuesday, though, this year - Feb 17th. I checked this as I'm thinking of only keeping the song till after Easter, not from religious observance, but just to prove I can and to pip the devout at their own game - eg Eid.
But as Shrove comes from 'shrive' which is 'hear someone's confession', perhaps with it being so close to Valentine's Day the confessionals will be heaving with sinners who punted three days earlier, and are getting it out of their systems in time for Lent.