LibCal:
Is used for both group study room reservations and the calendar of events.
You will need to log in to the calendar to see bookings and then fill out the daily room schedules.
The log in can be found at: http://uiowa.libcal.com/
More information on group study rooms can be found here: study rooms
Color Code for Calendar:
Below is the color scheme currently being used in LibCal for the various locations at Hardin Library: