Be sure your unit members are following the dress code. Check their bags in advance to see to it that they have not forgotten the appropriate clothing. Those not following the dress code will be asked to leave. Refer to the dress code section in this guide details,

The dance is closed to the public. Only registered participants may attend.
Unit leaders are responsible for the appropriate conduct of the youth.
All units MUST have at least two (2) unit leaders inside the dance at all times.