If you're in the area then get on your bike (yes, I said it) and get involved.
The BMF-ers will be touring the city on two wheels (check the Spanish Google map of the route here) and transporting the instruments and the musicians with them. Not only that, but the festival itself will be powered by bicycle energy.
The brainchild of the clever folks at Pleasant Revolution, BMF features acts like Ginger Ninjas (that's where the ninjas came in) Solrise and Cellojoe alongside local bands and presentations from NGOs on climate change.
It might just be the most fun you can have on your bike.
For more information on 10:10:10 events, keep your eyes on the site.