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The performing cast must be at least half drawn from students in grade 9 through 12. There can be younger or older cast members in the show, or helping with the orchestra or tech aspects, but this will affect qualification for awards.
Be sure you have secured the rights to produce your show. Cappies may request verification of publisher permission for any changes in a production which might otherwise violate the publisher's contract.
If you would like to have your Cappies show reviewed but not considered for awards, the rules allow that. If you would like your school to have a critics team but no Cappies show, the rules allow that too.
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