I'm not sure how many concerts are given there. It's a place where anyone can go speak, etc. Once, when I was much younger, there was an elderly lady there who wore a sparkly blue & lavender outfit w/a matching top hat and sang songs. She ended each song with a "cha-cha-cha."
I read in one interview w/hyde that he thought it was very cool that there was a park in London with his name. He said that everyone should be so lucky as to have a park named after themselves :)