Carole, I like the idea of Oct 29-30 for a meet and greet. That leaves time to plan. Years ago (I'm going to say 2008, because I went as "President Palin" in an attempt at "scariest costume") we did a Halloween "costume climb" at Ganhyeon, and before that we did a costume climb at Yongseo for Halloween.
There are usually enough ropes and draws; in general, if you have them, bring them (that goes for guitars, too)!
"If you can't do something well, you might as well learn to enjoy doing it poorly."
-- from a de-motivational poster, but I find it oddly liberating