Park lovers knocking off work early on a Friday in autumn, rejoice! Prospect Park will, at least partially, be open Friday despite President Barack Obama landing his helicopter somewhere on the grounds.
The Prospect Park Alliance was unspecific about which parts of the park would be accessible, though, and when pressed by Gothamist, said to ask the White House. So I guess they're in charge of the park now.
Maybe just walk around Prospect Park today, and if you get tackled by a Secret Service agent, that part of the park is closed.