Problem: Many photographs are uploaded to Wikimedia commons which can be assigned a date and a place by being sorted into a category such as "$month $year in $place". With the increasing number of such uploads of pictures from more recent years and from more places, it becomes necessary to create new categories accordingly. Doing this by hand is somewhat tedious work and prone to errors, so that some tool to simplify this task appears desirable. Also, some of these category names are rather long, so that an editor could benefit from appropriate category redirects. For instance, the category "$month $year in $borough" would redirect to "$month $year in the Metropolitan Borough of $borough" where applicable (uniqueness needs to be observed), and an editor should be able to set up such redirects just as easily as the correct categories.
Proposed solution: A tool be created in which an editor only needs to enter the place name and the year, and which then creates the category tree as needed in accordance with the existing structure.