You can enable Quick Events to easily add single events to your calendar.
Go to Admin Menu -> Options -> Advanced Options Tab ->
"Check to enable Quick Events" -> Save
The "Quick Events" option will open the quick events screen when adding an event. This is a time saver for organizations or individuals that need to add many single events to the calendar. It will also allow you to see the calendar, while adding new events. Click [More event options...] to open the Full Event editor to add repeating events or more event information..
Note: Enabling quick event will affect all users who enter events into the calendar.
To disable quick event you can uncheck the "Check to enable Quick Events" box and click Save.
Quick Events Screen