Translation:The children are playing with the old animals at Pentecost.
In Denmark? Yes. As with practically all holidays the religious background is largely irrelevant today but the social event still is a big thing.
Actually practically all "religious" holidays are much older than the current mainstream religion, they are just rebranded older holidays. There is one notable exception, practically the only original Jewish-Christian holiday ... Pentecost ;-).
Oh, and it is Shavuot in the Jewish tradition, as I just learned: https://en.wikipedia.org/wiki/Shavuot
It was on the Jewish holiday (after the crucifixion of Jesus of Nazareth) that the Apostles first spoke in tongues, being able to be understood by all the people who heard them, each in their various languages--The message of this "miracle" was that the Apostles' words were not for Jews (Aramaic-speaking Jews?) only, but for all.