The Great Peace Walk Russia Soviet Leningrad Moscow Event Souvenir Postcard

AZA Scarce postcard from circa 30 years ago which appears to be a celebration of a recent event that the buyer may be able to identify - It is used with a little surface marking but overall vg condition - I can tell you that it came from a modern day collection of cards where the recepient was trying to break the Guiness Book Of Records for most world postcards received and this card carries a message on reverse (not mentioning the attempt) but says "dear dear soul receive Love from all over the world.. we send you greetings and faith... believe in yourself" - A wonderful souvenir from a local Russian person