Sounds like you guys had a good time, great. I heard about this a little too late or I would have attended. Next year.
*Spread the word more. There are a number of sites to post at. Off the top of my head:
http://www.njcarshow.com/
http://www.pro-touring.com/index.html
http://www.lateral-g.net/
http://www.lt1tech.com/
http://www.camaros.net/
http://www.nastyz28.com/
http://www.thirdgen.org/
http://www.3rdgen.org/
http://www.camaros.org/index.shtml
http://www.chevyavalanchefanclub.com/cafcna/index.php
http://www.chevelles.com/forums/index.php?
The time of the year isn't so bad as long as it isn't 100 degrees. There are a lot of other events that occur that you may/may not want to go up against. Not too many in August. June & Spetember are pretty loaded. April & May can be rainy. July has shows too.
Even though I didn't make it, thanks for your hard work and I hope me & my 77Z28 will be there next year. (and maybe the 67 someday
)