I would LOVE to do this.
There is a local group that hosts some skills days events that are not quite up to the level of the gymkhana, more along the lines of the motorcycle test but it's still a hell of a lot of fun.
http://www.meetup.com/Eireannach-Rothai/I went to a few last year (and if you dig through their pictures you will see me on the SD in there) but because of work and having the bike torn apart for most the riding season I haven't made it to any this year. looks like they have one coming up on the 21st.
And I just found out a few weeks ago that one of the guys in my BJJ class is a motorcycle cop and they get together at a airstrip and practice once a month. I need to get the dang bike back up and running and see if I can join them to see what it's like.