If you use Outlook (2003/2007) on Windows or iCal
on a Mac, you can subscribe to your childs calendar, and it will add all games and practices to your calendar, even if the dates get re-scheduled!
Click on the corresponding link next to your childs name.
Note: If you are using Outlook 2003, save the file on you harddrive
and then use the File -> Import and Export -> Choose Import an iCalendar option