Who manages the main website?
If you are referring to the Wiki, it is a wiki. i.e., you can help manage it. :-)
promoting the currency and helping people find other interested individuals near them.
There are several ways to find others nearby who might be wishing to trade:
http://en.bitcoin.it/wiki/Category:Local The most popular appears to be: Bitcoin.local
http://www.tradebitcoin.com