It depends on how far back the event is. Plus, it's not easy to figure out as they are not linked on the past events page. I was trying to find an old flyer for an event from last year. Take a look at this url for this years Beech Bend Bash page for example:
http://www.aceonline.org/Events/details.aspx?event=601
The last 3 numbers are a number that have been assigned to that event. By changing that number I gradually worked back to find the flyer I was looking for. The numbers do not appear to be assigned chronologically though. They are probably assigned in the order they were announced or uploaded to the site. Something like that. So it depends on how bad you want to find it. I spent about 5 minutes and was able to pull up Last years Beech bend Bash Page.
http://www.aceonline.org/Events/details.aspx?event=502
I hope that helps.
