Problems viewing calendars in iCal after OS upgrade

I just upgraded my OS from 10.4 to 10.6, and now several of my calendars within iCal don't show up (2 show up, but 4 are "missing"). I've synced with my iPhone, and all the events are still listed on my phone, but I can't see them on my computer.
Any suggestions on how to make it so that I can see these calendars again?

Welcome to Apple Discussions,
It sounds like something went wrong in the upgrade process of iCal under 10.4 to 10.6.
Try the following in order:
1. First make an iCal backup, File > Export > Archive.
2. Go to Your User > Library > Application Support > iCal
__Move this folder to your desktop (this is the old 10.4 calendar location. don't misplace it)
Remove the following to the trash and restart your computer:
Home > Library > Caches
Home > Library > Calendars > Calendar Cache, Cache, Cache 1, 2, 3, etc. (Do not remove Sync Cache or Theme Cache)
Home > Library > Preferences > com.apple.ical (There may be more than one of these. Remove them all.)
__NOTE: Removing these files will remove any shared (CalDAV) calendars you may have access to. You will have to re-add those calendars to iCal > Preferences > Accounts.
Check iCal at this point. Did the calendars come back?
3. If not then quit iCal and follow this help article: http://docs.info.apple.com/article.html?path=iSync/3.1/en/9247.html
Check iCal at this point. Did they come back?
4. If not then go into the iCal folder you put on your desktop and look for several folders with extremely long names. Inside each one is a calendar called "corestorage.ics". Each one of these is one of your calendars.
Open each one, one at a time by double-clicking. When prompted, add each one to a uniquely named new calendar in iCal until you have restored the missing calendars. You can then delete any duplicate calendars that might have been imported.
Hope that helps.

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