Possible Clues:

• Fashion show's dry run?
• Share deals? Errs badly in practice
• Final practice before the big show
• Final practice for players hoping for success in long run
• Final trial run succeeded — share dealers excited
• Final run-through
• Practice session players are fully kitted out for
• Don tries interrupting actual final run-through
• Players' last practice session covered up
• First opportunity for panto actor to get into gear?