How do I designate where my imported photos, organized in Events, appear in the Library Events window?

Mac OS 10.8.5

iPhoto '11

When I import photos from my iPhone, I label the individual Events while they are still in the Import window. When I change to the Events window, the new events appear at the very top/beginning of the library. In order to get these new events into chronological order, meaning they should be at the bottom of the window, I have to drag the new events down through multiple years and thousands of pictures. I can't find anything in Preferences that I can change to specify I want them added to the bottom, not the top. Or, stated a different way, is there a mechanism to ensure the library is organized in chronological order? Any suggestions? Thanks!