Flamengo Football Tickets Rio DeJaneiro

Wondering if any Brazilian eagles can help me out. I’m travelling to Brazil tomorrow and will be in Brasilia on Tuesday, Wednesday, Thursday night. I’ll also be in Rio on Saturday and Sunday night. I’d like to see Flamengo at the Maracanã on the Saturday night but am struggling to see how to get tickets. Anyone done it before?

Also is there anything to do/see in Brasilia?

Thanks in advance!