The only time I bumped into an OTCA member in the wild was when I was at Westfield Parramatta, although this was after meeting up with Sinnertwin for a purchase.
Other than that, most bumps have been in fairs and at random events which don't feel wild enough to count. And even with non-OTCA transfans its mostly been people who I'm friends with (including a few Drum & Bass fans )