Mother's Day in the US falls on the second Sunday of May. Anna Jarvis campaigned for the day, and President Woodrow Wilson made it a national observance in 1914. The UK celebrates Mothering Sunday three weeks before Easter.
No. Mother's Day is not a federal holiday in the US, so government offices, banks and schools follow their normal schedule unless they choose otherwise.
Why does the date of Mother's Day change each year?
It is set by a rule rather than a fixed date: second Sunday of May. The day of the month moves each year to keep that weekday.