Rather than take on board to much choose a set meal time, morning tea, lunch or afternoon, or high tea. That way you are not catering too much. For a ballet party an afternoon tea works lovely as you can choose lots of pretty foods and there is no tomato sauce being spilt on beautiful dresses. Remember though that it is still important to provide both sweet and savoury options, not all children eat sweet food. Finger sandwiches, crackers, cheese and fresh fruit are great options.