According to the MTA Weekender , there will be Roosevelt Island F train service

to and from Manhattan this weekend. That’s 3 weekends in a row of good service. Also:

F Trains run local in both directions between 71 Av and 21 St-Queensbridge

Weekend, 12:01 AM Sat to 5 AM Mon, May 21 – 23

Trains stop at 67 Av, 63 Dr, Woodhaven Blvd, Grand, Elmhurst, Roosevelt Avs, 65 St, Northern Blvd, 46, Steinway and 36 Sts

And there will be E service to Roosevelt Island too:

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