I have been to Japanese car day for the last few years. Heck I even won the third prize for peoples choice last year with the REPU!!
My friend Bob is sort of in charge of this event the past few years. Last year we finally got some respect,and got a September event instead of the typical October date. This year they even gave us more respect,and gave us a August date. It stinks that it is on the 17th for me though as that is my oldest sons 6th birthday. I may still go for a bit anyway,as I told Bob I would help in any way.
Last years event was great,and we had some really nice cars come,including people as far away as NY in Datsuns,and even a Toyota Corona that was near mint(he won 1st place). I would deffinatly suggest going,and if you want I could even talk to Bob about getting you guys in one area if you like,or just spread out. This was a semi regular thing for the MARX-7 club,but that seems to be down to only Bob,his son,and myself now.
Edit: This year they are including bikes so the event is going to be huge. They are usually two seperate events. If you get te chance go to Mini/Micro car day. If you have ids it is even better because some people will use thier micro cars to do laps around with the kids,and they love it. Heck I would love it!!!!