Mother's Day

Mother's Day is an event in the in which the player's mother is celebrated. In North America it occurs on the second Sunday of May, though the date of the event differs by region.

and
On Mother's Day in, Tortimer appears near the Wishing Well. If spoken to he will give the player a Lovely Phone.

and
On Mother's Day in and, the player will receive a Pink Carnation in a letter from their mother, similar to how the player receives a Red Carnation on Father's Day.

While the Mother's Day does not appear in as a standard event, it appears as a Nook Shopping seasonal event throughout May in which the player can purchase the  from Nook Shopping for 600 Bells.

Recurrence
Mother's Day is dependent on the region of the game (North American, Japan, European, or Korean). For the European release of, it is dependent on the language of the game and not on the country set. For example, if the country set in the 3DS is Germany but the language set is Spanish, Mother's Day will fall on the first Sunday of May.
 * North America: Second Sunday of May
 * Japan: Second Sunday of May
 * Europe (English): Mothering Sunday (Fourth Sunday of Lent)
 * Europe (Spanish): First Sunday of May
 * Europe (French): Last Sunday of May
 * Europe (German/Italian): Second Sunday of May
 * Korean: May 8, and the name of the event is Parents' Day