That reminds me of Arthur Calder Marshall's The Fair to Middling - I think my association here is simply that this and MMR were published in Penguin's 'Peacock' series - it's about a group of orphans from a home for orphans with various disabilities (one is albino, one colourblind - I forget exactly all the details) who are given a trip out to the fair, except it's a very odd fair...
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