In Britain it's a case of 'been there, dont that'. Ours was way back in the middle of lent (half way between Pancake Day and Easter).
That didn't stop my inner child from jumping out of its socks in fear and potential guilt, when our U.S. friends started blogging about their own Mothers Day - tomorrow, isnt it?
I found THIS really interesting (and short!) BBC article on the possible origins of the UK Mothers Day aka Mothering Sunday.