The culture, lifestyle, or philosophy of Grateful Dead fans who travel to follow the band's concerts.
'Deadhead' + '-ism' (forming abstract nouns for doctrines, systems, or practices). Emerged in the 1970s as the Grateful Dead subculture developed its own distinct practices and values.
Deadheadism was essentially the first sustainable touring fan culture—self-organizing communities around a band that encouraged experimentation, recycling, and following your passion. In many ways, they invented internet-era fandom decades before the internet.
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