Cost: varies

Organizer: Peter Shapiro and Relix

What to expect: America's largest Earth Day celebration, with over 50 artists performing at different venues around the city, culminating in a full day of music at the Lincoln Park Zoo.

Why to go: Performers at the Zoo include the Dirty Dozen Brass Band, Meshell Ndegeocello and members of the Grateful Dead and the Allman Brothers. Oh yeah, and Bears backup QB Kyle Orton is the MC.

Additional info: Other acts include Bassnectar, Chicago Afrobeat Project, Miss Lori Holton Nash and The Gwalla Gwallas. Check the website for a full schedule, and confirm with the venues about set times and prices. Festivities at the Lincoln Park Zoo begin at 10:30 a.m. on April 20.

Centerstage Reviewer: Ben Rubenstein