Seeger's father was Charles Seeger (1886–1979), an important folklorist and musicologist; her mother was Seeger's second wife, Ruth Porter Crawford (1901–1953), a modernist composer who was one of the first women to receive a Guggenheim Fellowship.
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Bumgarner was also among the artists Lunsford assembled to play before George VI and Queen Elizabeth of England in June 1939 at the invitation of President and Mrs. Roosevelt at a White House concert of American music arranged by Charles Seeger and Adrian Dornbush (of the WPA) for the benefit of the first visit by a reigning British monarch and his consort on American soil.
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Folksinger Pete Seeger attended Lunsford's festival in 1935 at the age of 16 in the company of his father, composer Charles Seeger, then working for the music division of the WPA, and his stepmother, noted modernist composer Ruth Crawford Seeger, and would have heard Bumgarner perform there.