It is entirely possible, and actually very likely that arrangements have been made to get marathon participants from their various resorts to WWoS on the morning of the event and to return those guests to their resorts.
I’d strongly suggest contacting event organizers for more information. I have to admit that I missed in your first post the reason why you wanted to go to WWoS.
One of our members, Ddoll, has done some of the marathons in the past. I’d suggest you contact her via a private message and ask her what she did.