How often is this on? Is it once a month?
It is on the 2nd Saturday of every month it is supposed to start at 6pm and go through to 10pm but most arrive around 6ish and start leaving from 7ish with the majority left by 8:30ish it is generally a good turnout and so far there has been good weather and no trouble.
Munchies is on every Friday night which generally has good turnouts but there are some nights it is not worth wasting fuel on going.
Harry's has a old school reunion which I think is once a month. I went to that a few weeks ago for the first time and it was well worth attending but I they had nitro drag cars there which I am pretty sure was a once of. You also need to be there early to guarantee a parking spot.
You will find most of these events on Facebook.