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Sorry that you have not received an answer from a request over a month ago. Just saw your request as I have gone ahead to put together a sample note that you can send to those that attended your son's wedding ceremony and wedding party. Notes like these can be left short as telling the guests how glad you were that they took time to attend the very special day in your families life.
The note can be written such as:
Dear (guests name),
Thank you for taking the time from your busy schedule to share this important day with us. Your presence has made our celebration such a special event. It really meant so much to have you there. Looking forward to seeing you again soon.