Calendarsystem as Wordpress plugin - every user with a own private calendar

1) [login to view URL] shall be used to create a calendar system. If other, please align before. 2) Latest version of [login to view URL] shall be used (currently version 2.9.1) 3) The calendar system shall be created as Wordpress plugin. 4) Every user of wordpress shall have his own calendar (private – not public to others) 5) The calendar system shall make use of PHP, HTML, JavaScript, AJAX, … 6) The database to be used shall be MySQL. 7) The calendar systems shall support iCal / iCalendar format for synchronization with external tools 8) The calendar shall support a REST (CRUD) interface for creating, editing, deleting events 9) The default time slots used for the calendar shall be adjustable via MySQL entry in the database including a wordpress front end. 10) It shall be possible to change the start and end of the displayed calendar in the calendar view via MySQL entry in the database (e.g. minTime: '08:00:00', maxTime: '20:00:00'). 11) All day events shall be supported. 12) All actions (create, modify, delete) of a calendar entry shall be logged into the database 13) An appointment shall have a user from the wordpress system assigned. 14) If a new calendar entry is created it shall be possible to select one of the wordpress users from a dynamic search field. 15) Also it shall be possible to assign new names to a calendar entry that are not in the database as of now. Those names shall be added automatically to the database to a local database only accessible for the owner of the calendar. 16) It shall be possible to mark an appointment as complete by clicking on the calendar entry. 17) This mark as complete shall be captured in a database with the actual end time E.g. the appointment was planned from 3-4 pm but took until 4:15 it shall be tracked in the database. Automatically the current time shall be filled in a time select box. However it shall be possible to change this time. 18) It shall be possible to mark when the person who is assigned to the appointment is appearing. This shall be done by clicking on the calendar entry. The default time shall be equal to the current time. However the calendar owner shall be able to change this time. 19) The dialog (div) for creating or modifying a calendar entry shall look like the mockup that will be provided. 20) If an event is added, the calendar owner shall be notified via email