from https://ariss-sstv.blogspot.com/2021/07/august-2021-mai-75-sstv.html:
Looks like the folks at Moscow Aviation Institute are going to do a couple of quick experiment sessions of SSTV during parts of August 6 and 7. The setup is planned to start at 10:50 UTC on August 6 and transmissions will stop around 19:10 UTC. The activation on August 7 should start about 09:50 GMT with the conclusion of the experiment scheduled for 15:55 UTC.
It is anticipated that they will use the usual PD120 format on the standard downlink frequency of 145.800 MHz.
Several observations have been scheduled in Network for passes over 45 degrees, feel free to add observation bellow that elevation.