When I lived in the city I was part of a great group. They had stuff going on almost daily (play date, museum meet ups, lunches out, mom's night out etc).
Definitely join the NPN parent's network. It's a great resource with a community message board and lots of activities. You can find a playgroup there, as there is lots of them. I also joined Meetup.com which is good as well.
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Re: New mommie
Check Meetup.com.
When I lived in the city I was part of a great group. They had stuff going on almost daily (play date, museum meet ups, lunches out, mom's night out etc).
The mom's group I belong to is also from meetup.
I have heard others on this board mention that their local churches have mom's group - just another place that you may look into.