Back to "Ordinary Time." The Angelus takes over from the Regina Coeli, and we have our two-year cycle of daily Mass readings instead of the day by day uniqueness of the Easter season.
I found a great thought from Pope John Paul for this day after Pentecost:
"While it is an historical fact that the Church came forth from the Upper Room on the day of Pentecost, in a certain sense one can say that she has never left it. Spiritually the event of Pentecost does not belong only to the past: the Church is always in the Upper Room that she bears in her heart" (Encyclical on the Holy Spirit, n. 66).