Christmas has a taste, smell, sound, and looks that people associated with it. That's why it can be so hard to break free. All the senses are engaged with it. When Passover comes next year ask yourself these questions:

What special foods should we eat?
What songs should we sing?
What color theme should we decorate the house with?

Engage all your senses so that when your kids smell that special food, hear those unique songs, and see those particular decorations, they'll know what day it is.