Most of this stuff is spelled out in the documentation, but for the rest of us, here is a little tutorial on how to create a calendar in Drupal.
Perhaps this should be instead titled "How to Use the Views Calendar Module", since that is the glue that turns it into a gallery. But, since that seems a little too specific, the title will stand as is. Enjoy!
I watched the first video I made on how to create a dynamic photo gallery with Drupal using CCK, Views, etc.