According to the MTA:
F Jamaica-bound trains run via the M from 47-50 Sts to Queens Plaza
Weekend, 9:45 PM Fri to 5 AM Mon, Jun 19 – 22
No Jamaica-bound service at 57 St, Lexington Av/63 St, Roosevelt Island and 21 St-Queensbridge.
The Roosevelt Island Operating Corp ( RIOC ) adds:
Please be advised that the MTA has issued a weekend service advisory for the F train, which may affect travel plans. The Tram will run on a rush hour schedule from 7:00 AM until 10:00 PM to accommodate any increase in traffic. Please plan your travel accordingly and visit mta.info/weekender or call 511 for more information.
For electronic updates on F Train service, sign up for MTA Alerts at mymtaalerts.com.
and:
A 5/10K race will take place around the perimeter of Roosevelt Island beginning at 8:30 AM on Saturday, 6/20/15.
There will be No Parking on Saturday, 6/20/15 from 5 AM to 1 PM on the West Roadway between the Tram and the Blackwell turn around (rear of 405 to 475 Main Street).
The race will be completely contained to a protected perimeter of the Island. Expect minor disruptions in Q102 and Red Bus service during that time.