According to the MTA, there will be Roosevelt Island F Train Service

to and from Manhattan this weekend. Also:

F Jamaica-bound trains run local from 21 St-Queensbridge to Roosevelt Av Weekend, 12:01 AM Sat to 5 AM Mon, Sep 16 – 18

Trains stop at 36 St, Steinway St, 46 St, Northern Blvd and 65 St.

And there will be Roosevelt Island E Train service to and from Manhattan this weekend too.

E Trains run via F the in both directions between W 4 St and 21 St-Queensbridge

Weekend, 11:45 PM Fri to 5 AM Mon, Sep 15 – 18

During the September 7 Roosevelt Island Operating Corp ( RIOC ) Board of Directors Meeting, RIOC President Susan Rosenthal reported:

… that the MTA told her there will be Roosevelt Island F Train service on weekends at least thru October 16. Ms Rosenthal added that the Roosevelt Island subway elevator will be out of service the weekend of the 23-24 and RIOC will provide a Red Bus Shuttle to Manhattan at that time….

Here’s what Ms Rosenthal said: