Booking Calendar

Hi there.

1. I need a booking calendar.
2. Each individual user has a calendar of their own.
3. Only registered users can use the calendar. This is important.
4 On each of their calendars, the users state their availability for work.
5 Admin can then see all of the users available for work on a particular day or week?

Do you have a plugin that accomplishes this task, and if not, do you know of any that do?

Many thanks