I am in the process of planning my 2016 Trans American Trail tour from Astoria to Pueblo completing the route for me. TWACA.net (Touring with Adventure Cycling Association) is the website name and demonstrates the use of Wordpress plugins.
On the site there is a "Public Map Editor" where anyone can upload maps (kml,kmz,gpx) and download the editing results. Use is completely anonymous.
The plugins are in the Wordpress Plugin Registry: IBS Mappro, IBS Calendar, IBS Events. See IndianBendSolutions.net where they are documented. They are completely free and open source.