Date + Calendar Screencast (Drupal 6)
(If you are looking for Date + Calendar instructions for Drupal 7, look here.)
Here is a fast screencast covering the Date and Calendar modules for Drupal 6. This recipe illustrates one way to let your users post their own events (like parties, appointments, meetups, etc) that include date information stored in a field. Then you can see how to display these dates on a traditional calendar layout with all the events sorted into the correct days.
The modules doing the heavy work are the Date module (for use with CCK) and Calendar module (for use with Views). Something to note is that the Calendar module provides a number of default views that display a calendar-style layout. While you can simply enable the view called "Calendar" and call it done, this screencast instead demonstrates the two to three different steps one would take to build a calendar-style view from scratch. I chose to do it this way to help you better understand how the all the date and calendar parts fit together.
There is an entirely different approach to making dated nodes, which uses the Event module, but that is not covered in this screencast.
To make the best use of this screencast it would be awesome to have some prior exposure to the Views and CCK modules for Drupal 6. You should also have working knowledge of Drupal including the installation of contributed modules.
If you find this helpful, drop me a note. Also, if you find anything incorrect that I may have overlooked the please let me know so I can correct it.