The subway situation for this pre-Halloween weekend — late Friday night, October 28 to early Monday (Halloween) morning, October 31 — looks a bit scary. There will be no 2 or 3 train service in either direction below Chambers Street (2 trains) or 14th Street (3 trains) in Manhattan, so no service in either direction at Clark Street or the 2/3 platforms at Borough Hall. Fortunately, 4, A, C (except for Brooklyn bound; see below) and N trains (substituting for R trains; see below), should be running normally and 5 trains, which do not normally serve Brooklyn on weekends, should also be running here. For those traveling to or from Brooklyn, 4 and 5 trains will provide substitute service at 2 and 3 stations. Brooklyn bound C trains will be diverted to the F line between 34th Street-Herald Square and Jay Street-MetroTech, and so will be skipping High Street, but Brooklyn bound A trains (as well as Manhattan bound A and C trains) should be running normally. The do-si-do involving N and R trains continues this weekend, with N trains providing service in both directions at Court Street and the N/R platforms at Jay Street all weekend while R trains are diverted to the Q line over the Manhattan Bridge.
The following work week, Monday, October 31 to Friday, November 4, late nights Monday to Tuesday, Tuesday to Wednesday, Wednesday to Thursday, and Thursday to Friday, there will be no Brooklyn bound service at High Street, as Brooklyn bound A and C trains will be diverted to the F line between West 4th Street-Washington Square in Manhattan and Jay Street-MetroTech. Use 2, 3, 4, or N trains, which should be running normally, as options. All Manhattan bound trains should be running normally.
These are the planned service changes directly affecting service at local stations. Always check MTA Info for unplanned service changes that may affect local service or service on other parts of your trip, or for planned service changes that affect stations to or from which you may be traveling.