Paul - I've always wanted to go to Locke. I would only recommend from our experiences with Lombard that you get a large group of organizers, begin with constant communication with the town's "foundation," as well as other town leaders such as their chamber of commerce, etc. Seeing that it is a federal Historic Place, I'd highly recommend contacting the appropriate federal agencies, even if you plan on 2 smart cars in the rally. October would be a great time, but I'd start yesterday, if you want to do it right. Getting insurance, permits, meet notices etc done in 6 weeks is a challenge, but I bet you can do it.
Regarding Smartville, wouldn't that be a great place for a statewide rally!! It would take a lot of work, but anything is possible after Lombard. Are you volunteering, Chris?

I'd like to help out with both ventures, but I'm a little tied up at the moment, if you get my drift!
But, I'd sure like to celebrate in Locke or anywhere else for that matter by October. Good luck!