You're right...and it IS something we keep saying we must do. Especially at this time of year when punctures seem to be more prevelant. We can look and see if we can find a free afternoon (some Sat. maybe?) and meet somewhere with our bikes (the Park?) and each have a go at mending a puncture etc.
Might also be a good time to tie in a chat with newbies about what they need for a triathlon. A few years ago we had a chat in the Park with new members and showed them all the race gear (tri suits, race belt, boxes, elasticated lock laces, etc.) Its all totally new to some people.