Dave organised a Klunker ride. http://www.vorb.org.nz/christchurch-klunker-ride-t106206.html?hilit=klunker
Basic rules were: A bike pre-suspension and pre-indexed gears. A bunch of people turned up ranging from those who had been there at the birth of mountain biking through to people much younger than the bikes they were riding. A very pleasant ride was had, cruising old-school styles with a few drifty skids on the shingle thrown in for good measure!