published by Instituto Estadual do Patrimônio Cultural - INEPAC (the State Institute of Cultural Heritage), through the Secretaria de Patrimônio Cultural (rio's Cultural Heritage Department), this link shows a calendar of cultural events throughout the year.

furthermore, the link can be used to find out about cultural events for specific dates throughout rio de janeiro state, by selecting a city in the drop down menu.  

important - as exact dates and venues are subject to constant and last minute changes or cancellation, we recommend checking the exact dates either before getting to rio de janeiro or while in rio - excellent sources of information for all events, and available at all newsstands, is the magazines veja rio.