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As coordinator, you are responsible for finding good teachers for each class and emailing ensemble encouraging them to come. Also make sure to take attendance so it is known who fulfills the membership requirement. Class should not occur during production weeks, as members are hosed. The coordinator should make sure that classes do not run into rehearsals. The director can request/teach specific classes as long as they are useful to the membership at large. The director should not attend unless s/he teaching.
Ideas
Theater Games, Scansion, Fight Choreography