The final crew schedule for the week of Aug 3-9 was released recently and it showed a MAI-75 activity scheduled for Aug 4 and 5. This is soon after the Space X Demo-2 undock so changes to that event could impact the schedule.
The current dates and times of the activity are as follows:
This is the Moscow Aviation Institute SSTV experiment that is activate for orbital passes over Moscow, Russia. It has traditional been PD-180 or PD-120 and transmitting on 145.800 MHz.
**Update Aug. 3**
Looks like they made an adjustment to the schedule for Aug 5.
Aug 4 (12:25-18:10 UTC) is setup and day 1.
Aug 5 (08:15-18:25) is day 2 and close out of operations.
**Note** This is not the proposed ARISS event that was to remember the Apollo-Soyuz anniversary.
**Update Aug 4**
Seems the image theme for this MAI series is helicopters. Numerous images already posted to the Gallery at https://www.spaceflightsoftware.com/ARISS_SSTV/index.php