Don't start organising your seating plan too early or you will have to make a multitude of changes. Try to wait until all your guests have responded to the wedding invitation. Equally you don't want to be doing this at the last minute. Try to strike a balance and aim to have your seating plan finalised at least a week before the wedding. Write the names of all your guests on Post-It notes, draw out the table plan on butchers paper and start moving the names around to see what works.
P.S. Give yourself plenty of time - this is not a ten minute task!

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