There are spots open right now for the Walt Disney World Marathon, Goofy’s Race and a Half and the Dopey Challenge (scheduled for January 2024). All distances for this race weekend were SOLD OUT as of registration day, but RunDisney must have opened up spots this morning.
I just double checked and as of Aug 16 around 11:30am PST – you can register for one of those race spots. Good luck!
Get more information on the WDW Marathon Weekend Registration page here.