Setting iphoto events

Not clear what you are asking. Can you be more specific?

Events will always be in date order, but you can create folders and then albums within those folders to organize in whatever way you want. For instance, you could have a folder for "Vacations" and then under that and album for "Summer 2007", "Fall 2006" or "San Francisco 2005". Those folders and albums can be dragged into any order you want. Does that answer what you are asking? If not, please post back with more details.