Mother's Day in the UK

Well, for starters, we missed it. Who knew they had their own day?

It is always three weeks before Easter and dates back to the 1500s when it was traditional to visit your mother church once a year. Doing that was called "going mothering" and the day was called 'Mothering Day.' It wasn't about mothers back then. Since your mum probably went back to the mother church too, you visited your mother that day. Children traditionally made gifts at church and gave them to their mothers.
The British holiday was the inspiration for the American holiday which Julia Ward Howe brought to the US around the time of the Civil War, if I remember right. Today they are very similar in focusing on Mother's, and both have become heavily commercialized.
In our family, the US Mother's Day has the distinct advantage of being a week or so away from Shirleen's birthday, so we get to celebrate her twice close together.
And just a few weeks after that is the highlight of the year, Father's Day!