Chic-a-go-go, Chicago’s favorite puppet-and-hipster-hosted mix of Soul Train and a children’s show will be taping their 500th show this Saturday, March 10, 1:00-4:30 pm (CAN-TV Studio – 322 S. Green St). They’re celebrating by featuring guests from the last 50 years of Chicago music. Who? They’re not saying yet. But you never know who’ll show up on Chic-a-go-go.