Come see a trials demonstration including unicycle trials at the annual Seattle Bike Expo. The trials show starts at 2:15, but there's plenty else to be seen, including the amazing German artistic bicyclists.
More info can be found here: http://www.cascade.org/features-and-guests
In the past, people have parked at Gas Works and ridden 36ers to the pier. That's also an option if people are interested (and helps save on parking). If we do that, we should meet at least an hour earlier.