Concerts in the Scratch Orchestra were arranged by the youngest members first. So my chance came fairly soon after joining. I decided to arrange an walking concert in the area I lived in at the time - Richmond Hill.
It was my overall concept, whilst I invited participants to choose or compose rites and lead at the different stages (nodes). Now it feels, that in musical terms, and in relation to the democratic and collectivist ethos of the Scratch, I was ‘the composer’ rather than simply the organiser of this concert.. So I think, now, I can claim the Richmond journey to be a composition - and with a score that could be revisited half a century later.
See John Tilbury's 'A Life Unfinished' (p. 412) for an assessment of this piece within the Scratch Orchestra concerts.