I'm not sure if there is a single site/app for that, but it really helps if you are keeping an eye out for these things in your twitter, facebook, google+ strea

I'm not sure if there is a single site/app for that, but it really helps if you are keeping an eye out for these things in your twitter, facebook, google+ streams. I don't have many people from SF Bay area on my twitter, but I still found out about a couple of tech events, while I was there this summer.