I think buffet is a good idea. I would also encourage the familes of members to attend, if thats at all possible, making it easier for some of us to get there.
As for the alcohol, I would make it cash bar if at all. Something that is structured like this doesn't need to turn into a drunken rally, and like Tim mentioned, a cause for loosing the club. If some folks can't go a few hours without a drink, they really should find help.
I'm all for structured, family-friendly events.
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I USED TO HAVE an 85 Camaro 305 4bbl, 90 Firebird V6, 97 Firebird V6 (10 speakers!). Despite the two family vehicles, 3 kids, wife and mortgage, I can finally realize the dream - 88 TA almost all stock... for now.
http://www.cardomain.com/id/untameddave
Wanted this -

, but ended up with this -

for free. Can't argue with free.