Wednesday 4th April is Magna Mater in the Ancient Roman calendar; the festival of Cybele, Phrygian Great Earth Mother.
Her priests took on female identities and clothing to commemorate her son Attis, who, following a castration, died of the wounds but was subsequently resurrected.
Image of Cybele (right) is from Wikipedia (credit Marshall Astor - Flickr: Cybele-with-a-Portrait-Head, Public Domain)