non-triskaidekaphobe wedding

I am to officiate a wedding this Friday--on Friday the 13th. I pointed this out, early in our conversations, and they were aware and slightly tickled by the idea. Now, three days out, it is cold and raining on the beach where they want to hold the service. We have back-up plans; it will still be a lovely wedding...and we should all be more respectful of the power of 13 :-)