From ARISS official FB account:
ARISS SSTV EVENT UPDATE:
This update concerns the planned Owen Garriott Commemorative SSTV Event currently scheduled
for Aug. 1 – 4.
Please make note that the content of these upcoming SSTV transmissions may change. An update is expected after Friday, July 26 as to what the image content will be for the August 1-4 dates. If this change takes place, the Owen Garriott image transmissions will be postponed until another event can be scheduled toward the end of August.
Check this site: http://ariss-sstv.blogspot.com/