Roberto Medina, who created Rock In Rio, gave an interview for a brazilian site. He says: "It was pretty sad that she did not make it, I was waiting for her. I didn´t give up on her, she is still in my plans for 2019"   Source: https://extra.globo.com/tv-e-lazer/rock-in-rio/medina-planeja-show-de-lady-gaga-na-proxima-edicao-do-rock-in-rio-nao-desisti-21865704.html