I've loved attending performing arts activities (dance, theatre, music) since I was a kid, but only later in my 30s did I have the opportunity to discover what a wonderful array of arts organizations there are across the U.S. and Canada. As a true arts advocate, I want to encourage you to explore this world, and these links should help you.
By the way, if you particularly like music and visual arts, be sure to drop by Scott's Music Room and Scott's Virtual Art Room. .
Yale University School of Drama: Links Directory
Ballet Russes: The Story of Diaghilev's Famous Ballet Company