M Gildo Alfinete in M Zoião, 1999:
«We went to Brasília two times, participating in the Candango night.»
M Gildo doesn't mention the inauguration of Brasília directly, but M Pastinha had a group that traveled around Brazil (Rio, Porto Alegre) doing shows already in 1959. This group had M Canjiquinha and M Gigante and not M Gildo (who had started to learn with M Pastinha in 1959), nor M Gato Preto, but we can believe that the last was incorporated to help with the inauguration.
The most important: an image surfaced of the event and it looks authentic - it has capoeira and Juscelino Kubitschek, the then president.