If you are going to have a caterer at your wedding, ask them if you can request which foods they make. This way, you know that the food will be to everyone's liking. Also, ask them if you can have a sample of their food, so you know you will like it.
Do not wait until the rehearsal to begin preparing your flower girl and ring bearer for their role. Make time with the children to practice their movements and placing during the ceremony. Children thrive on structure and teaching them early will build anticipation to do their best. Explain all the importance that they carry on this day and they will adopt a responsible attitude.