If you can’t tell the Big Dipper from Orion’s Belt, or Venus from Mars, this Thursday is the last time this season to spend an evening stargazing with the Amateur Astronomers Association in Brooklyn Bridge Park. These are outgoing folk with stars in their eyes, and huge telescopes. Stargazing in Brooklyn Bridge Park is Thursday, 8:30 p.m. to 10:30 p.m. Look for the Syfy telescopes on the Pier 1 Promenade. And did we say it’s FREE? Yes, we did.