Currently Being ModeratedSep 27, 2012 1:38 PM (in response to Walterrufus)
Select the calendar you want to merge from in the calendar list in iCal. Go to File > Export... > Export... and save the file. Open the file you just saved and choose the calendar you want the events end up in when iCal prompts you. When you are happy that has worked ok delete the iCal calendar you exported from.
Currently Being ModeratedSep 28, 2012 7:30 PM (in response to Walterrufus)
Thanks. It's a pity I feleted the duplicated named calendars without becking up or exporting, and a pity I didn't realise that a number of tasks can only be undertaken in iCloud, renaming, deleting calendars for instance, and a pity the ICal data files are not backed up by time machine. Anyway, I/ve learnt something from my mistakes. Thanks for your help. WR.