If you have been using the .FIT files from the FWBA website, those files will now be available as a download from Ridewithgps routes.  Simply click on the event heading on the FWBA website and then view the route you would like to download, then go to the Export tab and click on the Red link for the FIT file.  This will download the file to your computer, then copy it to the Garmin's "Course" folder.  This service is only available to paid members of FWBA or paid users of the Ridewithgps service.