Creating custom list from hidden Event content type

For some reason, Microsoft has decided to hide Event content type in SharePoint (MOSS/WSS) and prevent users from creating a custom list based on that content type. To unhide Event content type:

1. Open your existing calendar on the site and go to List Settings
2. Click on Advanced Settings and change the settings to "Allow Management of Content Types", which will reveal the Event content type in that list settings
3. Click on the Event in the list of content types
4. Under List Content Type Information click on the Parent link, which is strangely enough also called Event
5. Under Settings click on the "Name, Description & Group" link and assign Event content type to the new group, for example "List Content Types". That's it, from now on you will be able to create custom lists based on the Event content type

There is another way to unhide Event content type, and even though I find it less graceful, I think it's worth mentioning:

1. Go to [Drive]:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\FEATURES\ctypes\ folder and backup the contents of that folder
2. To unhide Event content type, run
   stsadm -o deactivatefeature -filename "ctypes\feature.xml" -url http://[SharePointWebApp]
   and
   stsadm -o activatefeature -filename "ctypes\feature.xml" -url http://[ SharePointWebApp]