There are many cultural events taking place in Lodz throughout the year, among them many festivals. Let me list just a few. There's the Festival of Dialogue of Four Cultures in September, focusing on the multicultural past of the city, when Poles, Jews, Germans and Russians lived and built the city together, presenting music, theatre and other arts related to those cultures. The film traditions of Lodz are cultivated by Camerimage (November/December) - the one and only international festival honouring the art of cinematography, attended by international movie stars & directors. For photography fans there's the International FotoFestival in May. As we're talking about "-graphy" festivals, let's not forget about the International Festival of Comics - great place for all comic books fans. There's even more visual goodness at the Lodz Design festival.
I could go on and on and on about all those cultural events, as there's a host of other theatre, music, performance, and other art-related thingies happening all year round in Lodz. I'll update this post with more details when I feel like it.