White Rock Bummer

So I have been training for the White Rock Marathon for about 5 months now. The race is this Sunday and guess what....... I won't be running. My fiancee and I are photographers and there was a little miscommunicationbetween us,probably mostly on my part. We have a wedding scheduled for that day at 11:00, and unless I can run a 2:30 hr marathon I won't be able to "Run The Rock". Considering my personal best has barely been under 5hrs, I don't think I am going to be able to run that fast. So now the goal turns to the Mardi Gras Marathon or Cowtown Marathon. I am hoping for Mardi, but if things don't work out the Cowtown is an option.