I’m very sorry to hear of this situation but unfortunately I very seriously doubt that anyone will give up a spot on those dates given that it’s the last opportunity to have it in my ROL submission. Something that’s worked for people in a similar position is a Firefox plug-in called Check4Change that allows you to automatically refresh the registration page every 1-2 second and alert you when something has changed (eg, a spot opened up on one of those dates). Good luck!