I'm sure you didn't mean to be insulting, but what you wrote actually was insulting. There are some people in Quebec who believe in separatism, but not most. And especially not 99% of English speaking people here.
All I said is that the day was not a holiday anybody here celebrates. There are many Canadian holidays that we do celebrate (Canada Day, Victoria Day...). But the one you mentioned is not. Although as I said I cannot speak for every province. Perhaps there are some that consider it a holiday, although I have not heard of any.
Jennifer, I'm just trying to have fun with you on the subject...certainly not trying to tick off the Quebeçois population.
But, about
"Commonwealth Day", it was my impression you had never heard of it, especially since you wrote:
"I don't know if any other parts of the country celebrate this day, but i have never even heard of it."
According to the linked article, the day was not a traditional "holiday" but a day when ALL schools would extol the virtues of being a member of the Commonwealth. This supposedly -- allegedly -- has been going on in schools since 1977.