When you create a calendar event and save the event please make sure that the calendar for which the event relates to is selected on the right-hand side of the main Calendar section otherwise you will find that your event is not shown.

To select the calendars you wish to see events for please make sure the relevant calendar names are checked as shown below:

Please make sure that you have selected the calendars you wish to see displayed.  The example below shows all calendars are selected: