All trained, now what?

Everyone at your school just recieved Smartboard Training, and they are excited to check out the lab with their classes. One problem... at your school, there are 24 classrooms of students with 1 technology lab that houses 27 computers. You also have one mobile lab at your school with 28 computers. How do you schedule all the teachers for the time that they want? The teachers were given access to Google Calendar, but only the trained understand how to schedule the lab time. Trained on Google Calendar at your school doesn't mean teachers know not to schedule repeated times that may overlap others schedules. Teachers are beginning to arrive at the lab during the same times, etc. As a technology directory at your school, what would you do?