Lecture space available to rent?

I'm looking for a venue to use for an ongoing lecture series, for two hours at a time once a month, possibly twice. We need to be able to seat 50-100 people. An arts-related space, like a co-working facility or gallery, would be perfect, since the series will address topics important to the creative community.

It can be in Williamsburg/Greenpoint, PS, Dumbo, P-Heights, Clinton Hill, or Gowanus.

Can anyone recommend a place that's reasonably priced to rent, or might make a deal to split revenue from ticket sales? Thanks.

The Lyceum (on 4th ave, park slope)?

Some nonprofits rent out their event and meeting spaces for such purposes. The spaces are listed here: http://www.npccny.org/spaceads.htm#mtg