Seventeen people went on trial in the second Moscow Trials.
Many were sent to death for their crimes in the Great Purge.
Source
The Moscow Metro was opened to the public.
Elton John and his entourage flew into Moscow, making him the first western pop star to tour the USSR.
The 14th IAAF World Championships opened in Moscow, Russia.
Adolf Hitler's German military attacked Moscow.
Chemical elements Moscovium, Tennessine, and Oganesson were added to the Periodic Table of Elements.