Have you tried the special Google Apps calendar type called resource calendars made especially for rooms and other resources. No need for timestamps. The resource is simply not available if it is booked.
Must be set up by admin first.
Sent from my iPad
Hello School IT:
For those of you who manage flexible computer lab or other tech resource scheduling in your elementary school (and find it successful) what is your model, parameters, limitations, etc. for this?
Thank you in advance!
Technology Integration Specialist
Burlington School District
Burlington, VT 05041