Thousands of amateur theatre groups performed regularly in Britain during the 1930s but their activities have generally been overlooked by historians. Important features of the amateur world were the regional and national festivals organized by the British Drama League and the Scottish Community Drama Association. In this article Don Watson examines how the festivals could provide opportunities for progressive drama by groups outside the organized Left, and considers the League in relation to the Left theatre movement of the time. It broadens our understanding of where politically engaged theatre took place in the 1930s and thus the appreciation of British amateur theatre as a whole. Don Watson is an independent historian and holds a PhD from Hull University. His theatre research has been published in Labour History Review, Media, Culture and Society, and North East Labour History.