Join the second Passion Projects talk on April 4th, featuring Mozilla engineer Heather Arthur, who will discuss her work on Firefox developer tools and her contributions to open source projects. The event will be held at GitHub HQ in San Francisco, and registration is required due to limited space. The first Passion Projects event was a success, featuring Rachel Myers from Modcloth, who spoke about RailsBridge and organizational growth, and participants can access her talk and a panel discussion online. The series aims to bring together new faces and foster a community of learning and sharing at GitHub.