Sitting in English class at school. Principal announced over the loudspeakers that the President has been shot, and details were upcoming. We were all stunned, the teacher was crying quietly, though she quickly regained her composure. Probably another 20 minutes or so, and then came the announcement that the President was dead. We were released from the remainder of the day shortly after that.
The assassination of JFK touched absolutely everyone.
My experience was about the same, 5th grade. I don’t recall getting out of school early, though.