To enable calender in user system after removing admin Rights in domain

Since there is a local security policy on each computer that allows/disallows setting the system time, you should be able to configure a group policy with the same effect. Below are instructions for how to set local system settings.
Setting system access permissions on Windows XP -
To set permissions on Windows XP:
1. Select Start > Settings > Control Panel.
2. In the Control Panel, open Administrative Tools.
3. In Administrative Tools, open Local Security Policy.
4. In the Local Security Settings window, expand the tree for Local Policies and select User Rights Assignment.
5. Right-click the required user right, and select Properties. The appropriate properties window appears (for example, Change the system time).
6. To add permissions:
a. Click Add User or Group. The software opens the Select Users or Groups window.
b. Specify the user ID that requires this permission.
c. Click OK.
d. Click Apply then OK to save your changes and close the Properties window.
7. When you are finished, restart the machine so that the updates will take effect.
Also, here is a link to MS site on how to edit the registry to allow a user to access the time/calendar - http://support.microsoft.com/kb/300022
Hope that helps a bit.

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