On the drop down list for events waiting to be invoiced they are in numeric order of their schedule ID. I would LOVE if that list could be manipulated to show events waiting to be invoiced by event start date. I don't invoice groups/organizations until their event has started or is over. I have to make sure that their program doesn't get canceled a week in because of low enrollment or lack of space or any other reason. Also, the schedule ID doesn't mean that event is happening first. It just means it was entered before the other events.