Quick Bill/Fleur question

While looking up Bill Weasley's Lexicon entry, I was surprised to see "The wedding [to Fleur] is scheduled to take place in France during the summer of 1997". If that's right, does anyone know where in HBP it says that? I couldn't find it -- at the end of the book Ron was telling Harry he needed to return to the Burrow for the wedding. Also, it sounds unlikely that JKR would shift the action across the Channel at the start of Book 7 ...