Card Reading Day
Card Reading Day falls on February 21, and whichever kind of card reading you mean, the same psychological effect explains why the message seems to fit.
February 21
3 holidays
International Mother Language Day
International Mother Language Day falls on February 21, and it marks students shot in Dhaka in 1952 for demanding that their own language be recognized.
Sticky Bun Day
Sticky Bun Day falls on February 21, and the difference between a sticky bun and a cinnamon roll is which way up it was baked.