The Detroit Jazz Festival, the world's largest free jazz event, and its year-round programs have survived for the past 12 years largely on the generosity of Carhartt heiress and philanthropist Gretchen Valade.
In recent years, her support has made up about half of the organization's annual budget and made up for shortages in sponsorship revenue, other donations and vending revenue.
It's a donor relationship that can't continue forever - or can it?
Even as the festival continues
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