In 1964, at the end of the third session of the Second Vatican Council, Pope Paul VI formally declared Mary the “Mother of the Church.”
They say his sermon should have been more “appropriate”—meaning, I can only surmise, that he should have preached whiter.
Quotations by Pope Francis on Pentecost and the Holy Spirit.
Customs originally varied from church to church and from diocese to diocese.
It’s a rich topic with many aspects.