Eavis was educated at Wells Cathedral School, and embarked on training as a school teacher. Following her mother's death from cancer in 1999, Eavis left her teaching studies and assisted her father in running the festival.
From 2000 onwards, she has taken an increasing role in the organisation of the Glastonbury Festival. She has worked for Oxfam helping out with their "Make Trade Fair" campaign. As part of the "Make Trade Fair" campaign she visited Haiti with Coldplay lead vocalist Chris Martin to publicise the negative impact of western corporations' trade practises upon coffee farmers.
At the 2007 festival, Eavis curated her own stage called The Park. Acts that performed there included Kate Nash, Martha Wainwright, Africa Express and Adele. The Park returned in 2008, headlined by Dizzee Rascal, Pete Doherty, and Shlomo. In 2010 at Glastonbury Festival's 40th Birthday, notable acts performing on The Park Stage included The xx, Thom Yorke, Candi Staton, Biffy Clyro, and Empire of the Sun.
Eavis met music manager Nick Dewey on a trip for Oxfam. Five years later, the couple married in August 2009 at Pilton Methodist Chapel, and in June 2011 Emily gave birth to their first child, named George. The couple are now responsible for booking all of Glastonbury's main stages, with Dewey now the festival's Head of Music Programming.
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- "2016 Emerging Talent Competition Finalists Announced - Listen now!". Glastonbury Festival. 16 March 2016.