Ballet dancers from England arrive in New York on 18 August 1916 to reinforce Pavlova's troupe on an American tour:

Myaskovsky: Symphony No. 5 in D major Op. 18 (1918-19) youtu.be/3KNloGU40PY?si… via YouTube Hailed 'the first Soviet Symphony', it was extraordinarily well-received when Malko conducted the premiere on 18 August 1920 in Moscow. This recorded performance is still to be bettered:

Jascha Spivakovsky (18 Aug 1896-1970) was a child piano prodigy discovered in Odessa by Josef Hofmann. He concertized widely, even after settling in Melbourne with an Australian wife in the 1930s. His was an illustrious career, but leaving no studio recordings, his fame dimmed.

von Meck letter:

Gabrielle 'Coco' Chanel (19 Aug 1883-1971) was closely associated with the Ballets Russes in the 1920s as generous patron and costume designer. She saw her friend Serge Diaghilev in Venice shortly before his death on 19 August 1929. It was her birthday! She paid for his funeral.

19 August 1954, Covent Garden: Margot Fonteyn rehearses 'Firebird' with advice from Tamara Karsavina, who created the role for the Ballets Russes in 1910.

Maria Tallchief, Serge Lifar and Vera Zorina at the Venice grave site of Serge Diaghilev, on 19 August 1957. This was the 28th anniversary of his death.

Tchaikovsky letter to brother, Modest:

20 August 1882, Moscow: A concert devoted to works by Tchaikovsky at a major Art and Industrial Exhibition included the first Russian performance of the Violin Concerto (with Brodsky as soloist), and premiere of the festival overture, 'The Year 1812'.

In Nadejda Rimsky-Korsakov's 20 August 1911 letter to Debussy, essentially she complains about the actions of the Ballets Russes in Paris in transforming her late husband's 'Scheherazade' into a ballet.

Nijinska's Russian Ballet in Hoylake (Merseyside), 20-22 August 1925:

Lewisohn Stadium concert, 20 August 1939:

On 21 August 1929 in Venice, a funeral barge carried the body of Serge Diaghilev from the Grand Hotel (where he died) to the city's island cemetery. Among close friends following in a gondola were Serge Lifar and Coco Chanel. Coco picked up Diaghilev's funeral 'and' hotel bill.

Natalia Dudinskaya (21 Aug 1912-2003) was from Kharkov, where she first learned ballet. In 1931 she graduated from Leningrad's Vaganova School straight into the Kirov company. There, she danced leading roles until well into the 1950s. One of her last partners was Rudolf Nureyev.

First performance in Britain of Prokofiev's Fifth Symphony:

On 21 August 1959, Leonard and Felicia Bernstein, along with members of the New York Philharmonic, arrived in Moscow at the commencement of a Soviet tour.

Paris Conservatoire student Claude Debussy (22 Aug 1862-1918) spent the summers of 1880-82 in the household of Tchaikovsky's patroness Nadezhda von Meck, acting as her children's music teacher and pianist (playing lots of Tchaikovsky). He was also a member of the 'von Meck Trio'.

Michel Fokine died 22 August 1942 (from 'Musical America'):

On 22 August 1954 in Edinburgh, a Diaghilev Exhibition was formally opened (by Alicia Markova) as part of the Edinburgh Festival. It marked the 25th anniversary of Serge Diaghilev's death. This Ballets Russes exhibit proved to be so popular it would be transferred to London.

The New York Philharmonic Orchestra commenced a 1959 tour to the USSR with a concert in Moscow on 22 August.