Code refactoring

I would like to propose a more technical meetup... one about code refactoring. Most of us are developers (or we were developers) and we all had to/still have to struggle with old code and code refactoring. So, let's meet and discuss what is code refactoring, refactoring to patterns, how to start with the code refactoring, best practices, maybe even with short examples. For this meetup I would like everybody's involvement and opinion because it's a subject of interest. Also, maybe some of you can propose some books to read or links to look at.