Sunday May 12 is the traditional Mother’s Day first celebrated by the following:

“In May 1908, Anna Jarvis organized the first official Mother’s Day celebration at Andrews Methodist Episcopal Church in Grafton, West Virginia. There was also a Mother’s Day event at one of Wanamaker’s retail stores in Philadelphia later that same day.”

https://www.umc.org/en/content/methodist-history-the-founding-mothers-of-mothers-day