It seems to me that this would be a good topic for a free-space page. That is: a page that provides a catalog of places that were popular wedding destinations of the past (or more recently, for that matter) due to particular circumstances. Each of these places has a slightly different story that could be documented on this page. Circumstances include (but are not limited to) absence of a minimum marriage age and absence of a waiting period after getting a marriage license, and proximity to a big city in a nearby jurisdiction would increase a place's popularity.
The page I envision would benefit from multiple contributors (because no one of us is likely to know all of the stories...) and should be linked to and from categories (and free-space pages) for the towns mentioned. After some effort to document the stories of these places, it might become easier to figure out how they could be categorized tastefully.
When I see a couple who married across the state line from their home, I wonder about the circumstances, and a page like this might help with research.
PS - I think the mere presence of a local quick-wedding service industry in towns like Reno, Nevada, and Gatlinburg, Tennessee, can make these towns popular wedding sites even if there are no longer any legal advantages to getting married there.
