A good starting point would be the local newspapers.

Newspaper records
http://www.forum.forest-of-dean.net/index.php?mode=thread&id=11969#p11971

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For those of you who are interested in Carnivals in the Forest we have an excellent booklet which covers the Ruardean Carnivals.

Carnivals of Ruardean 1906-1987.pdf
http://www.forum.forest-of-dean.net/index.php?mode=entry&id=1561