If it's always the next following Sunday from whatever 'today' is, you don't need a macro. To see how to do this and just about everything else you might want to do with dates in Word, check out my Microsoft Word Date Calculation Tutorial, at:
http://windowssecrets.com/forums/sho...ation-Tutorial
or:
http://www.gmayor.com/downloads.htm#Third_party
In particular, look at the item titled Calculate a Stepped Date - for which the field is already configured to calculate 'next' Sunday. Do read the document's introductory material.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]