The 4 train won’t be running below the Brooklyn Bridge/City Hall station in Manhattan (and the 5 train doesn’t run to Brooklyn on weekends; this weekend the 5 won’t be running below Grand Central) from 11:45 Friday to 5:00 a.m. Monday. This means no service in either direction on the 4/5 platforms at Borough Hall. The 2 and 3 should be running normally, and there will be more service than normal on the R/N line at Court Street and Jay Street-MetroTech, as N trains, which normally replace the R late at night, will be running local all weekend, and R trains should be running normally as well. Manhattan bound A and C trains will be diverted over the F line between Jay Street and West 4th Street, so from 11:45 p.m. Friday to 5:00 a.m. Monday there will be no Manhattan bound service at High Street. Use the 2, 3, R or N as options for Manhattan below West 4th.
The following week, from 11:45 p.m. to 5:00 a.m. Monday to Friday, there will be no Manhattan bound service at Court Street or on the R/N platform at Jay Street.
For diversions, cancellations, and skipped stations that don’t directly affect service at local stations but may affect your travel plans, see MTA Info.