It’s been a while since we’ve had a true “green light” weekend, one with no planned subway service changes directly affecting service at any local stations, but this coming weekend — Friday evening, July 13 to Monday morning, July 16, is one. Be on the alert, though, for unplanned changes, especially on the 2/3 line where they seem to be happening frequently since work was completed on the tunnels connecting Brooklyn with Manhattan.
The following work week — Monday, July 16 to Friday, July 20 — things get a little complicated, but only late at night. From Tuesday to Friday, each night from 9:45 PM to 11:45 PM there will be no R train service from Manhattan to Brooklyn, and so no R service from Manhattan to Court Street or to the N/R platforms at Jay Street-Metro Tech. From 11:45 PM to 5:00 AM there will be no R service in either direction at these stations. From 11:O0 on these same nights, though, Brooklyn bound Q trains will be taking the N/R line from Canal Street to DeKalb Avenue, thus providing alternative service from Manhattan to Court and to Jay. On these same nights, from 11:15 PM to 5:00 AM, Brooklyn bound N trains will be diverted to the express line over the Manhattan Bridge, and so will not be serving the Court or Jay street stops. Again, the Q is your option. Also, each night from Monday to Friday, from 9:45 PM to 5:00 AM, there will be no trains running; however, 2 trains should be running normally and provide service at Clark Street and at the 2/3 platforms at Borough Hall. Bottom line: you can get from here to there, and from there to here, but not always by the usual train.
For planned service changes that may affect travel on other parts of the system, either during the weekend or the following week, and for unplanned disruptions, see MTA Info.