Dogpatch Labs (36 East 12th Suite 200) and General Assembly (902 Broadway 4th Floor) both have a number of companies in them although they are really working spaces and not events (GA might have somethings going on).
Can I just show up and say hi at DogPatch?
Its Across the river, but the Hoboken tech meetup was a great place to have been last night.
There's also a happy hour/party for new work city tomorrow night as well- I'm sure you can find details on meetup.com