Jalima, you don't seem to understand what is being said. I am sure that the children at the school will enjoy their Easter Bonnet parade but that is nothing to do with Christianity. I imagine all children, whatever their faith will be allowed to join in.
My argument is that people who say they may insist on the word Easter being used in connection with an egg - or else they take offence and take to the press - are just wrong in the power they believe they have over both none Christians (the majority), the English language, and the direction which we are moving in. They are trying to bully people into using a word, in a particular place, where those paying for the advert did not choose to.
I really don't know how to get through the density of misplaced moral outrage other than by saying, again NO ONE IS STOPING YOU USING THE WORD EASTER but equally I defend the right of those not wishing to use it to do whatever they want too.