I always thought of Pentecost as a one-time thing, and a complete surprise. Which doesn’t track with the way that the first reading (Acts) starts out - “When the time for Pentecost was fulfilled,…”
That makes it sound like it was a regular thing. Like everyone had gotten an invite from Andrew. “Peter and I are doing Pentecost at his place. John’s bringing his famous hummus. See you Sunday.”
As it turns out, that's kind of right. Because before there was Pentecost, there was Pentecost. That is, “Pentecost” is the Greek name for Shavuot. In Jesus’ time, Shavuot was one of the three travelling festivals, where everyone would go to Jerusalem.
Which is why they were all in one place together. For Pentecost. But the Pentecost they got wasn’t the Pentecost they were expecting.
More on this tomorrow.