ARISS postpones anniversary SSTV event

The Amateur Radio on the International Space Station (ARISS) Slow-Scan TV event set for December 26-27 has been postponed due to 'complications in planning,' ARISS has announced

The ARRL report ARISS now is targeting mid-January as the next possible opportunity

This year marks the 15th anniversary of continuous Amateur Radio operations on the International Space Station. The first ISS crew conducted its inaugural ham radio contact from NA1SS in November 2000. The first Amateur Radio on the International Space Station (ARISS) school contact took place the following month.

ARISS will post more information as it becomes available.
http://ariss-sstv.blogspot.co.uk/

Source ARRL
http://www.arrl.org/news/view/ariss-postpones-anniversary-sstv-event

ISS SSTV activity planned for mid January
http://amsat-uk.org/2015/12/17/iss-sstv-activity-mid-january/