I guess if the enduro folks are required to remove their signs and stakes these people should be required to return and remove their items.
My kid and his girlfriend ran into that group yesterday while hiking near Batsto. He couldn't figure out what was going on.Perhaps the event had not ended yet. This appears to be what was going on, looks like a big thing; they paddle, bike and run over the 12 hours.
http://goalsara.org/2017-races/the-savage-12-hr-race/
I sure hope they are not wearing shorts like in the photo.