Advertise it on Craigslist (yes, I've seen bitcoin ads on Craigslist), localbitcoins, meetups section of forum, other forum, Facebook, etc.
Show up each week and wait.
Worst case scenario, you get extra time to read books or check email.
Best case, you get a free exchange and place to trade bitcoins for cash and vice versa.
Not only cash! If you live in an interesting, diverse, and somewhat popular area, you can have people selling turnips for bitcoins, or gold/silver, or goods/services. You never know what kind of monster you can create...
+1
Grassroots. It's how national elections are won (ask Obama campaign strategists).
Using the internet to spread a message makes it doable for any campaign.
Who would ultimately benefit the most from this? The early miners/purchasers/adopters of cheap BTC. Maybe some of them would help support a bounty campaign to begin an internationally loose but semi co-ordinated Sunday afternoon coffeehouse/market/public square etc meet up. THE BITCOIN HOUR - Could be any day or any venue but at a set time. And focus OUTSIDE the US for this. Let the US gov continue doing exactly what they're doing while BTC growth outside the US eventually dwarfs the US, making their actions insignificant.
As for those interested in buying 500/1000/5000/100,000, MTGOX is available. Nothing stopping you from buying now.
Just my 2 cents.
While I agree that local exchanges are an awesome idea and should be encouraged, international Bitcoin buttonwoods would not be immune from federal regulation either. Most developed countries are all part of the same central banking system, whether you're in France, Peru, Turkey, or Israel. (http://en.wikipedia.org/wiki/Bank_for_International_Settlements). The fact of the matter is that exchanging Bitcoin for fiat is not a welcomed activity, and if you're doing out in the open in broad daylight, you're just inviting unnecessary attention and scrutiny.