I just called BRMC and they said the weekend of may 13-14 still has some cabins open and so far seems to be lightly booked for them now.
T.w.o. has not answered their phone yet, but on their site apppears that the same weekend with them 13-14 is the best to book as well.
The 3rd weekend in may is booked pretty good at both sites, so we should pretty much commit to the 13-14 of may. Lets just wait for Pete to chime in and decide which campground he prefers and hopefully everyone's schedule will allow this to roll without a hitch.