If you go, review your yearbook beforehand so you will recognize & remember more folks.
We had a class of about 900. Went to 10 year, it was fun. 30 year, a waste of time--very few people I recognized or remembered (should have looked at that yearbook). Big classes, you find out interesting things. One of my classmates was on the USS Pueblo when the North Koreans captured it on the high seas & kept the crew prisoner for quite awhile. A gal I knew since elementary school ran a foundation giving aid to groups in 3rd world countries. Sirhan Sirhan, who assassinated Bobby Kennedy was a year or two behind us & I kind of knew him, was never mentioned.
Smaller graduating classes would be more fun, I think.