well I know that mother's day in the UK is in march....but I couldn't tell you what date. Hang on.........
right. I've googled it, and mother's day in the UK and Ireland is the 4th Sunday of Lent:
Motherhood has been celebrated through the ages. The earliest tributes to Mother's Day date back to the annual spring festival the Greeks dedicated to Rhea, the mother of many deities, and to the offerings ancient Romans made to their Great Mother of Gods, Cybele. Christians celebrated a Mother's Day of sorts during a festival on the fourth Sunday in Lent in honour of Mary, mother of Christ. In 17th century England this day was expanded to include all mothers and called Mothering Sunday. In North America, the idea of Mother's Day was first suggested in 1872 as a day for women and mothers to join in promoting peace.
Since then, Mother's Day has spread and is now celebrated around the world, though not always on the same day.
England, Wales, Scotland, R.O. Ireland:
4th Sunday of Lent (always in March/April)
US, Canada, South Africa, Australia, Netherlands, Denmark, Germany, and most other countries that celebrate Mother?s Day: 2nd Sunday in May
and from a different website:
Think one Mother's Day a year simply isn't enough? American moms can get a second dose of attention a month later by celebrating France's Fetes des Meres on June 6. A French tradition that was inaugurated by Napoleon and made official in 1950, this day honoring mothers dates back to Ancient Greece and is found in several countries.
In France, the tradition calls for a variety of honors for mother. She might receive a gift from her children, or the children might let mom (or mere) relax, and, as all things in France, it usually culminates in a large dinner in mom's honor. These dinners are usually a major family affair.
The main thrust is that this is a day when, much like in America, mothers do not work and their families cater to their whims. Mothers here also usually get cards and flowers. Sometimes children write short poems for mom.
Why not offer your mom a chance for two Mother's Days in a year. She doesn't need to get another full-blown Mother's Day, but perhaps moms can get a nice dinner or even a poem. Just in the interests of exploring other cultures and customs, of course.