icalendar | Imported calendar events not synching

I just imported several years worth of events into icalendar on my iMac (mountain lion). I imported these from an outlook file.

Ical has categorized these calendar events as "On my Mac" and I have named them "palm". (All of these events were shaded in grey. I changed them to yellow.)

Unfortunately, I don't see these calendar events on my ipad or iphone.

I would like these events to synch via icloud to my ipad and iphone. Is there a way to do this other than clicking on each calendar entry and manually changing the 'color' ?

Other than these 'imported calendar events", all other calendar entries (icloud : "work", "calendar" & "home") 'synch' via icloud between my imac, ipad and iphone correctly.

See attached screen shot.

Thanks in advance!