[support] Calendar for scheduling work

[Hakan]

I will be upgrading an existing Drupal site from version 5 to either
version 6 or version 7 but also extend it considerably at that same
time. For one thing, e-commerce will be added and also a scheduling
function (has nothing to do with e-commerce) with the following
capabilities desired:
*	calendar display month-by-mont similar to the default month
view of Google calender,
*	ability for the website administrator to schedule one or more
events each day which he should be able to make visible to selected
users on a per-event basis;
*	ability for these users to mark days - or parts of days - as
available or not available or may be available;
*	finally and ideally, some way of generating semi-automatic
e-mails based on the various events each user has confirmed that they
will accept.

In short, this will be a calendar-based system for scheduling
instructors for various courses (which generally last two to five
hours, i.e., no recurring courses), offer each course to selected
instructors based on their geographic location and the availability
they have marked in the calendar and keep track of the workflow of the
scheduling process and last, to be able to send reminders and
information to the instructor who has accepted an assignment.

Can something like the above be accomplished (or almost accomplished)
with a canned module(s)?