Earlier this year or maybe last year, I was looking at the Web site for my old high school (the one I graduated from, not the other ones). I saw that the class of 1964 was having a reunion (the following day) and had invited members of all other classes to participate.

I did not go.

I don't think they count (they're just practice) until your class has its 50th. https://www.youtube.com/watch?v=xMj0w6r4GPA