in the city of rio de janeiro, one of the most traditional places to see a roda de samba is pedra do sal - historically known to be the area where quilombos resided and essentially would gather to listen to samba while mingling with each other, today the tradition lives on, and every monday and friday visitors and locals go and take part of the authentic samba event - here is more infomation about pedra do sal.  

published by the instituto perreira passos - ipp, and by the the Rede Carioca de Rodas de Samba is a map showing all the 'rodas de samba' in metropolitan rio de janeiro via this link - choosing the day of the week will show circles on the map where to find samba, with the color red indicating a street event, the color orange indicating a free event, and a the color yellow indicating a paid event. Additionally, the map provides information of the artists and a variety of pictures and contact information.