Ah, seems like a misunderstanding of the purpose of not clearing some fields. The reason these fields are not cleared is because they are repetitive. Someone entering multiple talks for the same conference would not want to re-enter these fields every single time since these fields are common fields to the same conference. Thus leaving these fields uncleared would allow the ability to more quickly add new talks to the same Event / Room / Category / Time etc....


When editing though someone might change the Event or date, etc.. so you should check if it was changed in the case of editing a talk.