I'd actually though about the Friday at GBM as well, I've done a couple of those in 2015 & they were fun.
I quickly got used to faster guys & gals passing me on the inside, the outside, anywhere they could ha ha but was never intimidated by it & found it an enjoyable day where I actually learnt a lot.
My laps times are far quicker now (than they were then) so was thinking of giving it another go unless you have to be a paid up SOAR member to participate on the Friday TD.
Other than that, it will be GBM on the 29th methinks.