The Lodi Juggling Festival is an annual event during which a large group (a few hundred) jugglers get together at Micke Grove Park in Lodi, California. I was first exposed to this festival this year, and it was my first juggling festival ever. I will go to more.
The Lodi Festival (from here on out, just Lodi) was great. It's a three day event that attracts people from all over. People camp at the park, and so any time of night and day, you can find people to juggle with.
It's a good place to learn new things, because there are people who have already learned most anything you could think of to try. Also, people all around you are learning new things, too, and everybody's dropping things.