Carnaval is everywhere in Brazil, starting like 2 months before the official start and ending like a month after. And it’s a sh*t show. The parade you see on tv is like not even what most people consider carnaval? Like you should do that once but the main part is all the blocos, which are big street parties that wind their way through the streets following some band or music on a truck. And they are every day in all parts of the city/country. You could just ask your hotel where are the biggest/best blocos today and they will tell you. And you wear a costume based on theme of the bloco or as little as possible or whatever and just drink and leave trash all over and go to the bathroom wherever and try to hook up or whatever. So I know you would like to nail down an itinerary but I’m gonna say it doesn’t matter. Just show up and you will be in the middle of it and everything will work out.