Avoid unreadable display when showing many events

Is there any way to configure FullCalendar to show full boxes to avoid a display like this:

http://uclu.org/whats-on

Here there are just too many events happening in parallel, resulting in unreadble thin vertical lines for each event.

Perhaps expanding the hours sections would help? Can FullCalendar be configured to show an item at just the start time, rather than stretching to the finish time?