From BART.gov :
Join us for the second annual BART Blue Sky Festival, just in time for Earth Day, Thursday, April 19, 2012.
Absolutely free from 11 a.m.-2 p.m. at Justin Herman Plaza in San Francisco. Get great environmental info and giveaways from dozens of eco-exhibitors, healthy and organic food samples, live music by the Venusians, carnival games with an eco-twist provided by the Sustainable Living Roadshow Conscious Carnival and more!
Get a BART Blue Sky Passport at the festival, fill it with stamps from six festival exhibitors and redeem it for a free $6 BART ticket. The first 5,000 people who turn in a completed passport will get a free $6 BART ticket right at the festival!
All stamped passports will then be entered in a drawing to win a folding bike. Official rules will be available at the festival. Folding bikes are a fantastic way to get to and from BART because folded bikes are allowed on all trains at all times. Read more about the BART bike rules .
This is an outdoor festival…rain cancels!