Dear texasnana
There is a solution to your problem.
OK, all your pics are in one event.
Highlight the event. On toolbar Click "Events" and from the dropdown, Click on "Autosplit selected events".
This should then create a separate event for each day based on the date stamp of each photo.
You have the choice of splitting/separating the events by "hours", "day", "week", "year" etc depending on your preference and the number of events you want to have.
This does not take up any more space because in iPhoto, there is one library of photos. Whether you create Events, Albums, Smart Albums and so on; it is not copying or duplicating them simply rearranging them according to your taste.
Hope this helps.
Ian