ICal event have disappeared after upgrading to Lion. Please help!

After upgrading to Lion, pre-existed calendar events (Newer ones) have disappeared. How can I recover?

Greetings Alex,
If you have a backup of your computer from before you upgraded then you can restore the data from your backup: http://support.apple.com/kb/HT1553
--- Let us know if you have a backup and if so, what type it is and we can tell you how to restore your calendars.
--- If you don't have a backup, consider starting one following the article above ASAP.  Anyone with information they care about on their computer should have a backup.  It is a hard lesson that every computer user learns at least once.
If you do not have a backup from before you upgraded:
1. Make an iCal backup so you don't lose what you have currently:  Click on each calendar on the left hand side of iCal one at a time highlighting it's name and then going to File Export > Export and saving the resulting calendar file to a logical location for safekeeping.
2. Go to iCal > Quit iCal
3. Remove the following to the trash and restart your computer:
Home > Library > Caches > com.apple.ical (There may be more than one of these. Remove all files and folders that start with this phrase)
Home > Library > Calendars > Calendar Cache, Cache, Cache 1, 2, 3, etc. (Do not remove Sync Cache or Theme Cache if present)
Home > Library > Preferences > com.apple.ical (There may be more than one of these. Remove all files and folders that start with this phrase.)
---NOTE: Removing these files may remove any shared (CalDAV) calendars you may have access to. You will have to re-add those calendars to iCal > Preferences > Accounts.
---NOTE: To get to "Home > Library" in Lion:
4. Open iCal and see if the events you are looking for magically reappear.
If the events don't appear and you don't have a backup or have the events on another device like an iPhone or iPad then your only other option would be to use data recovery software or a data recovery company to try to get the data back (although it might be easier to just re-create the data as best you can).
Data Recovery software examples:
http://www.prosofteng.com/products/data_rescue.php
http://www.macintosh-data-recovery.com/
http://www.subrosasoft.com/OSXSoftware/index.php?main_page=product_info&products _id=1
You can contact a local Apple Authorized Provider to see if they offer data recovery services: http://www.apple.com/buy/locator/service/
There are many nationwide / worldwide data recovery companies out there.  Here are a few examples:
http://www.ontrackdatarecovery.com
http://www.drivesaversdatarecovery.com/
http://www.totalrecall.com/
Hope that helps and best of luck to you.

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