This is going back a bit, but from 1984-8 I provided are large part of the childrens' play area at the Glastonbury Festival in Pilton, Somerset through my business Airspace Touring.  This comprised one of the largest collections of supervised inflatable play structures in one place, some specially built for the event, plus games and face painting.

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This pre-dated the familiar 'castle' shape with its constraining walls...instead the shapes were open, varied and great fun, and in many ways safer.

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Similar facilities were provided for festivals and local authorities across the UK and abroad.