But not so in the old days, as Father Mark points out, in an excellent post on the "suppression" of the "Octave of Pentecost" (similar to the Octave of Christmas and Easter) that was celebrated up unto 1969, He includes this anectdote:
The story goes that on the Monday after Pentecost in 1970 His Holiness Pope Paul VI rose early and went to his chapel for Holy Mass. Instead of the red vestments he expected, green ones were laid out for him. He asked the Master of Ceremonies, "What on earth are these for? This is the Octave of Pentecost! Where are the red vestments?" "Your Holiness," replied the Master of Ceremonies, "this is now The Time Throughout the Year. It is green, now. The Octave of Pentecost is abolished." "Green? That cannot be," said the Pope, "Who did that?" "Your Holiness, you did." And Paul VI wept.
Paul VI did not weep alone. Many wept with him. It was reported that Catherine de Hueck Doherty of Madonna House was inconsolable. Faithful the world over were speechless at the brutal removal of one of the Church Year’s most cherished moments. In some countries the hierarchy were frightfully embarrassed: the civil calendar had retained the Monday and Tuesday after Pentecost as holidays, while the Church had erased them from hers. Little by little, the voices of those seeking the restoration of the Pentecost came to be heard in high places.