on this link by the secretaria da cultura de rio de janeiro it is possible to see all the cultural events of all types by month that take place in angra dos reis and ilha grande, by selecting a date range and scrolling the menu of cities on the left. 

on this page, the prefecture of angra maintains an official webpage that can be used to check news and events on the island of ilha grande.

on this page we publish more information on ilha grande, including history, attractions, dining & lodging, and how to get there.