I went to the Best of France and Italy show last weekend and had a great time. It was Italian sensory overload. We had over 150 Alfas alone and by some accounts there were 400 cars at Woodley Park in Encino. By far the largest informal car show anywhere. The atmosphere was one of camraderie and appreciation of all marques without any of the snobbery of judged shows or concours d'elegance outings, not that I don't like those show also, I do, but this one was special. The cars that were shown were mostly drivers, some more than others, but all fun.
Here's my photo album of the show and it is by no means comprehensive.