This event launched in May of 2015 with a total of 14 steps in the quest chain. The other name this quest may be known by is "Elven Artifact", as that is what shows in the quest assignment window.
The launch of "Mother's Day" coincided with the Elven Magic quest line.
Quest Tasks Step-by-Step for "Elven Magic" a.k.a. "Elven Artifact"