One "hack" to this is to join one of these incubator/accelerators without being "selected" through some competition. In other words, the ATT Aspire accelerator mentioned above is housed in GSVlabs. You can rent a desk at GSVlabs for a monthly fee and get tapped into the mentors and network.
You can also do this at the EDGE Accelerator in NYC.
I would highly recommend this approach because being vetted and referred by the community is a key to raising money (besides traction of course).