I wrote a few days ago about the Immortal Regiment of Russia action (https://dmitryexplores.com/2020/05/10/the-immortal-regiment-of-russia/).
There is an international version of the Immortal Regiment: http://www.polk.press/en
The site currently has much more information about the war in Russian than in English, but still you can, for example, watch various videos, including military parades at Red Square from 1941 and many other years:
read some stories, for example how a Soviet spy helped in saving Polish city Krakov Nazi-made flood:
and listen to 14 famous war songs: