Q: iCal issues after El Capitan upgrade.

Dexter,

Are your iCloud calendars listed under the "Calendars" button?

Go to  Calendar>Preferences...>Accounts>iCloud Account>Account Information> and uncheck/check "Enable this account."

I had the same problem. I think I reinstalled my iCloud account, & calendar entries retired, however I no longer have the map function in ical. It was sometimes a pain in the ***, but still annoyed that it no longer functions. Any suggestions?

Checking and unchecking worked for me. Thanks.

Cancel that.

Problem returned and checking and unchecking didn't help, nor did cleaning cache, repairing permissions etc.

What did work was deleting Google from my calendar and other accounts. Once google was gone my calendars came right back.

Go into your accounts in Calendar and dump Google. Your iCal calendar should come right back.

I also no longer have the map function:

Adding a map to iCal event

Checking the enable box did nothing for me.  But going through the motions of adding a new iCloud account took care of the problem.  I clicked on the "+" button to add a new account, selected iCloud, then entered my Apple ID and Password.  Calendar populated.