Apple has calendar subscriptions for iCal. How can you add them to the iCloud calendar?

Hello there, DonDon915.

The following Knowledge Base article has some information that should help you with that:

iCloud: About subscribed calendars

http://support.apple.com/kb/HT5029

Particularly the following:

Setting newly subscribed calendars to push with iCloud

If you are subscribing to a new calendar in either Calendar or iCal and you want to have it pushed to your devices with your other iCloud calendars, simply make sure that the Location field is set to iCloud in the new subscription screen that is displayed when adding the subscribed calendar to Calendar or iCal.

If you've already subscribed then you can:

Reconfiguring existing subscribed calendars to push with iCloud

To push a calendar you have already subscribed to in Calendar or iCal (on OS X Lion 10.7.2 and later and iOS 5 devices):

1. Open Calendar or iCal.
2. Click on the Calendars button in the top-left.
3. Select the subscribed calendar.
4. Select Get Info from the Calendar or iCal Edit menu.
5. Change location from the default On My Mac to iCloud:
6. Click OK.

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro D