This weekend, San Francisco hosts the major — and pricey — music festival Outside Lands in Golden Gate Park. The main attraction (besides the tunes)? Toyota and nonprofit Global Inheritance will give fans a chance to use some “sweat equity” to create energy on bikes and see-saws, earning as a reward a sno cone they’ve made with their own power.

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Organizers say they expect at least one major celeb to make his own sno cone at Outside Lands, so if yummy treats and green energy aren’t enough to get you to invest your sweat equity, maybe star-gazing will.

+ Global Inheritance + Toyota