What would you think? - Q about FBIL and his fiance

FBIL and his fiance are having two weddings, the first in the US and the second in her home country because all of her family is still there. The home country wedding is supposed to happen in 2010, and they called us up recently and told us the dates they were thinking about -- one of the dates they said they liked the best was 2/16/10, which is our one-year wedding anniversary! We told them 'no way' because that is our wedding date and they didn't seem to understand why this was an issue. What would you do????

Edited: Ok, given the below responses, let me add some more info. They are telling us we have to travel to inland China in winter for this wedding. It is already going to cost us thousands of dollars and the event will span several days apparently. Right now we are hoping to tie it into an anniversary trip because we are not spending that money and flying all the way to China for 4 days and then coming home, we figure we can at least go somewhere warm afterwards.