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When it comes to wedding formals and family formals, what strategies do you employ to produce optimal results?

If you have a large group of people please warn them prior to the ceremony.  Recruit a close friend or family member with the loudest voice to help corral everyone and arm them with a list with all the family and friend combinations.  Its easiest if we start with the biggest group photo first.   Then we can move on to smaller groups of friends and family members.