The calendar and the form are linked. With two consecutive left-clicks on rectangles of the calendar a time interval will be selected. The corresponding times will appear in the drop-down menu of the booking-form bellow.
Obviously the form can be filled out without using the calendar above to define the time interval.
To get the information who booked when, move with the mouse over a given calendar-square remain there for about one second. The details of the booking will appear as a tooltip.