I am also marrying a Frenchman in the Loire Valley and having very similar difficulties. Try www.loire.net-- it is an English website, and they do say they can arrange weddings in the Loire. If you call them maybe they can give you advice on La Reunion.
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Replying to:
I am a American, he is French.
It is very difficult to find info in weddings in La Reunion.
If you have any info, links, or advice, I thank you in advance.