Emily Eavis, organiser of Glastonbury Festival; Radiohead guitarist Ed O’Brien; journalist and author Caitlin Moran; Billy Bragg, singer, songwriter and activist; photographer Mary McCartney and chair Dorian Lynskey will be joining us for an evening to celebrate 50 years of Glastonbury.

Michael Eavis first opened what was then known as the Pilton Pop, Blues and Folk festival in September 1970, inviting 1,000 Somerset residents to enjoy a headline slot from T Rex on his farm for £1. The festival soon found an identity in left-wing activism and political affiliations with the Campaign against Nuclear Disarmament, Greenpeace, WaterAid and Oxfam - and today it is one of the world’s most popular contemporary arts festivals, attracting audiences of 135,000 and over the years featuring legendary headlines sets from Radiohead, Pulp, The Chemical Brothers, Adele and many more.

In Glastonbury 50: The Official Story of Glastonbury Festival, a new book that celebrates and marks 50 years of Glastonbury, Michael and daughter Emily share never-before-heard stories about the festival, including its tentative early days - as well as stories from key performers through the history of the festival, including Adele, Jay Z, Dolly Parton, Billy Bragg, Jarvis Cocker and Noel Gallagher.

Eavis and her guests will share their own festival memories and explain why Glastonbury is like no other festival.

Tickets for this event are £25 or £45 with a signed copy of Glastonbury 50 (RRP £30).

Guardian tickets have now sold out, but some tickets are still available via the Union Chapel's website.

Running time: 90 minutes, no interval. Doors will open at 7pm.

Wheelchair users and visitors who require an assistant may bring a companion free of charge. To book a free companion ticket please email guardianlive.events@theguardian.com