1914 – "(...) admirer of Vicente de Carvalho, sends him sonnets asking for his opinion. Having confirmed that the letter had been received and not having obtained an answer, Mário makes a resolution to which he will remain loyal: to give attention to all who write to him, in particular the youngsters, the newcomers". (Mário’s Image, p. 21)

1917 – In November he meets Oswald de Andrade, who takes the speech "O Brasil na Guerra" to Jornal do Comércio in which Mário had saluted Elói Chaves, conference speaker at the Conservatory.

Encounters Anita Malfatti, and also the Modernism in her exhibition. Mário goes to see the work on several occasions and becomes friends with the painter. It is here that Mário, Oswald, Guilherme de Almeida, Ribeiro Couto and Di Cavalcanti all meet together.

1919 – In Mariana, he visits the symbolist poet Alphonsus de Guimaraens, whom he greatly admires.

1920 – Forms the São Paulo "avanguardistas" with Oswald de Andrade, Menotti del Picchia, Guilherme and Tácito de Almeida, Rubens Borba de Moraes and Di Cavalcanti.

Frequents Brecheret’s studio and relates with Haarberg.

1921 – Travels to Rio de Janeiro to make contact with modernists; meets Manuel Bandeira.

Makes a reading of Paulicéia Desvairada at the home of Ronald de Carvalho.

1922 – Begins correspondence with Manuel Bandeira.

With the return of Tarsila do Amaral from Europe he forms, with her, Anita Malfatti, Oswald de Andrade and Menotti del Picchia, the "Grupo dos Cinco".

1923 – Through Oswald de Andrade and Sérgio Milliet, who had gone to Paris, Mário enters into contact with Blaise Cendrans, Ivan Goll and Marinetti, exchanging books and inscriptions.

1924 – Gets to know young writers from Minas Gerais who are linked to modernism, amongst them Carlos Drummond de Andrade with whom he begins a long series of correspondences.

Begins correspondence with the writer from Rio Grande do Norte, Luis da Câmara Cascudo.

1927 – In Natal, he meets Luis da Câmara Cascudo and other writers and artists from the Northeast, linked to Modernism.

1929 – An extract of the letter to Sérgio Milliet (June of 1929) about the difficulty of publishing in Brazil: "Life in Brazil is made of the comradeship of presence".

1932 – Beginning of the correspondence with Oneida Alvarenga.

1939 – Regularly attends the group of young writers: Murilo Miranda, Carlos Lacerda and Moacir Werneck de Castro of the Revista Acadêmica.