When we first started planning DrupalCamp Michigan we didn't have high expectations for turnout. Southeast Michigan, where the camp is being held, is not known for a large or active Drupal community. When we sold out less than 3 weeks after we had the idea for the camp it was a very present surprise. But, we knew there were more people who wanted to come and an opportunity to reach more people. So, we've added more space and re-opened registration.
Special thanks to Jason Savino for jumping all over this, coordinating with others in the local community (especially Mike O'Connor from the Commerce Guys who was also working on this), and making the extra space happen quickly.