Would also like to make a distinction between the rural car shows and the ones in adelaide... aka riverland and kadina, mt gambier etc vs the extreme hp show, autosalon (if its on), the show and shine @ glenelg etc...
I like the rural shows cos it gives me an excuse to get out of the city, so that'd be my primary interest
Could be an idea to have a couple combined bbq/dyno days, and some purely social events like pete just mentioned - and try to stagger everything out over the course of the year...
More than a couple cruises would be nice... one every 3 months perhaps, or 2 in summer, 1 in winter
-D
Edit - I'd also be doing a fishing charter or two thru the year, so that could possibly be considered an event - tho last time I organized we had 18 organized at first and ended up with only 4 (including myself - I would be ruthless in organising these just because of the 'attrition rate')
Attrition rate = people who say they gonna go to an event and then get really uncommunicative when people ask for status...