"Mother's Day" is celebrated in May. It originated in the United States, where it was first celebrated in 1908. It has since become a worldwide celebration of mothers and motherhood, held annually on the second Sunday of May.

Here are some example sentences in Engpsh and their Chinese translations:

I'm sending flowers to my mother for Mother's Day.
我要在母亲节给我的母亲寄花。

Let's take Mom out for brunch to celebrate Mother's Day.
让我们带妈妈出去吃早午餐庆祝母亲节。

I made a card for Mother's Day to show my appreciation for all that she does.
我制作了一张母亲节卡片，以表示我对她所做一切的感激。