P: Working on two catalogs at once

I support this idea.  Not necessarily for the use case of having multiple catalogs (say one per wedding) but more for other use cases.   For example,  discovering way too late that you had started using a 'not quite current' backup catalog as your prime catalog at some point in the past and never noticed.   Now you're trying to fix that and need to recover work done in that gap by using "Import from another catalog".   Being able to use two catalogs at once can make figuring out what is misisng much easier.   

In similar situations, I have gone so far as to set up my laptop next to my desktop and opened one of the catalog on each device so I could see them both at once and flip back and forth without having to do a 'relaunch' each time.   But that too is a cumbersome activity requiring copying a bunch of stuff to the laptop.

This was the only way I knew to recommend a feature for Lightroom to add in the future which is why I'm posting about it. It's not a good idea to load multiple weddings into one catalog and separate them by collection for multiple reasons, mainly to avoid the loss of work should the catalog ever be corrupted. But also because multiple weddings means tens of thousands of images which is a lot to ask a computer to load at any one time.

If your chosen workflow is not optmal for you, you could consider using collections instead of seperate catalogs. Create a new collection(or collection set) when importing a new wedding, then possibly adding categories as sub-collections (Collections inside collections). 

Doing it this way would allow you to start working on the next wedding while exporting the previous one.