Hi Marian, your question has so many conditions to be able to answer. It depends on age of cast, size of community, size of performance space and performance traditions. 2 is usually perfect in a small community, but know that a majority if parents will come every performance. Many families are used to dance recitals which have multiple performances for their convenience. If you are worried about running out if seating, add a third night and do a presale. I personally would rather have an enthusiastic house both nights.