How to delete only events I previously imported from .ics files?

I have a very frustrating problem. A few months ago I added a few .ics calendars and merged them with my main calendar on iCal. For example I added a list of dates of baseball games for my favorite team, a list of holidays in Britain, and a few other .ics files.
Then tragedy struck: I synced my Blackberry to my Macbook and iCal and then somehow all the dates on the imported .ics became one day earlier. For example, valentine's day, which should be February 14, is on February 13 on my calendar. And Christmas is on December 24, rather than December 25.
Strangely, all the events that I manually added (such as my business meetings), are correct and were never changed. Only the dates/events from the imported .ics files changed.
I have waited a few months, but the frustration is just too much. I can not easily delete my main calendar, because it literally has hundreds of business meetings spread out over a 6-9 month period.
So my question is this:
a) Is there a way to move all the date back 1 day for only things imported from .ics? All these holidays and events are i a small purple oval at the top of each date, so they are definitely look different than the business meetings I entered, so I hope there is a way to selectively move them.
b) Is there a way to delete all those events and then try re-importing them?
Tks for your help!

Right, I only have 1 calendar. Ok, I did this but nothing seems changed. Here is what I did:
I followed your directions and it ran for about 4 min and I heard my fan starting up and my Macbook slowed. Then things got better and my iCal crashed. I forgot to close it before I ran this I received no error message, but nothing changed in iCal and all the One Day Events were still there.
So I then had the iCal closed, and attempted all steps again. Again it ran for about 4min, things slowed on my computer to a crawl, then got better. Then the Apple error window opened and said again iCal quit unexpectedly (I had not started it in the first place, but I assume the script had to open it to do the work, right?).
So now I'm back where I started -- it seems like the script was doing something but it didn't do anything to my one day events
I REALLY appreciate your help!

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