... the "Modify" tab to insert a delay in an existing, downloaded iCal file at a specified date and duration. Just starting out with P90X and find yourself too sore to continue with the next week? Insert a delay of 7 days to take the week off and continue where you left off later. Going on vacation? Insert a delay. But don't be a vegetable!
Updates are not fully tested and you may have to just delete the old calendar and import the modified version if it does not work.
Requires .NET 4.0 client profile