See How They Run (play) in the context of "Three Blind Mice"

Amateur theatre, also known as amateur dramatics, is theatre performed by amateur actors and singers. Amateur theatre groups may stage plays, revues, musicals, light opera, pantomime or variety shows, and do so for the social activity as well as for aesthetic values. Productions may take place in venues ranging from the open air, community centres, or schools to independent or major professional theatres.

Amateur theatre is distinct from the professional or community theatre because performers are usually not paid. Amateur actors are not typically members of actors' unions.