What is the state of play? / Seth Giddings -- A lifetime in the playground (inaugural address to 'The state of play' conference, University of Sheffield, 1998) / Iona Opie -- The making of folklore books: chiefly the experiences of the Revd John Brand and the Opies / Iona Opie -- The lives and legacies of Iona and Peter Opie / Julia C. Bishop -- Colleagues in the Antipodes: conversations with Iona and Peter Opie / June Factor -- The lore and law of the playground / Amanda Bateman and Carly W. Butler -- From local to global: the evolution of musical play in secondary schools / Athena Lill -- From the wild frontier of Davy Crockett to the wintery fjords of Frozen: changes in media consumption, play and literacy from the 1950s to the 2010s / Jackie Marsh -- Meeting in the Middle East: Iona and Peter Opie's contribution to co-existence education / Simon Lichman and Rivanna Miller -- Child play is serious: children's games, verbal art and survival in Africa / Ruth Finnegan -- Iona Opie: distant relations and 'the kindness of friends' / Peter Barnes -- O.P.: collection as celebration of children's self-organized play / Anna R. Beresin -- Iona and me / Mavis Curtis -- What the Opie's have meant to me: opening teachers' eyes to the literacies of the playground / Elizabeth Grugeon -- Making sense with the Opies / David Reedy -- Stumbling into folklore more than 50 years ago / J. D. A. Widdowson -- Books worth (re)reading -- Steve Roud.