Siobhan McKeown wrote a great post at WP Realm about how the vocabulary and mentality around Hack Days for WordPress events (or any events really) need to change a bit. There are people dedicated to the WordPress project, and not all of them are developers. She explains it in detail, noting the many things non developers can contribute to such days. And I made my own comment as well.
In short, these events should be open to anyone that wants to contribute back to the project, and not be an exclusive event for developers only. Doing so, I believe, will only making the project as a whole better. Let’s fork the name “Hack Day”. I vote we call them “I love WordPress” days.