My point about organising by date in the finder is that it's really easy to do, but over time and with large numbers of photos it's useless for quickly finding the photo you want.
If you want to do it then simply name the Events as you require on import. Only takes a couple of seconds.
The core issue here is that you have a limited system based on dates that's been forced on you by the primitive Canon software. Now you're using a much more flexible and capable app, and are trying to force the primitive system into that.
You can choose what to export from iPhoto: a single photo, an Event, a group of Events, or even the whole Library.
This User Tip
https://discussions.apple.com/docs/DOC-4921
has details of the options in the Export dialogue.
Just as an FYI here are some of the possibilities that organising with iPhoto offers:
I use Events simply as big buckets of Photos: Spring 08, July - Nov 06 are typical Events in my Library. I use keywords and Smart Albums extensively. I title the pics broadly.
I keyword on a
Who
What
Where basis (The When is in the photos's Exif metadata). I also rate the pics on a 1 - 5 star basis.
Using this system I can find pretty much find any pic in my 50k library in a couple of seconds.
So, for example, I have a batch of pics titled 'Seattle 08' and a typical keywording might include: John, Anne, Landscape, mountain, trees, snow. With a rating included it's so very easy to find the best pics we took at Mount Rainier.
File -> New Smart Album
set it to 'All"
title contains Seattle
keyword is mountain
keyword is snow
rating is 5 stars
Or, want a chronological album of John from birth to today?
New Smart Album
Keyword is John
Set the View options to Sort By Date Ascending
Want only the best pics?
add Rating is greater than 4 stars
The best thing about this system is that it's dynamic. If I add 50 more pics of John to the Library tomorrow, as I keyword and rate them they are added to the Smart Album.
In the end, organisation is about finding the pics. The point is to make locating that pic or batch of pics findable fast. This system works for me.