If your criterion for organizing pictures is events and you have a baby, you will soon discover that your folder structure doesn’t support baby pictures well. If I want to use “events” as the criterion, then all my baby pictures folders would read something like 06_06_15-home or 06_06_17-park . I would have hundreds of folders like that in the first year for my daughter. This doesn’t really make much sense and would create lots of problems when trying to look for specific pictures.