According to the MTA Weekender:
F Jamaica-bound trains run via the E after 47-50 Sts to Roosevelt Av
Weekend & Holiday , 9:45 PM Fri to 5 AM Tue, May 23 – 27
No Jamaica-bound service at 57 St, Lexington Av/63 St, Roosevelt Island and 21 St-Queensbridge.
Expect crowded Roosevelt Island Tram Cabins this weekend on your way home.
Crowded Manhattan April 27 Weekend Tram Platform With No F Train Running To Roosevelt Island Plan accordingly.