I assume you are discussing Lightroom Classic and not Lightroom, but you haven't really made that clear.
The depth of the subfolders name is limited by the operating system (there is a limit on the total number of characters in the full path name) and also Lightroom Classic (I think this is Windows only) does not allow the panel to be wide enough to handle very long folder/subfolder names. You can try hiding the parent folder in the Lightroom Classic folder panel to see more characters in the of the subfolder name.
However the sub setting of the events is being lost. Many events have important stages or categories. How can I preserve these?
In my opinion, the best way to preserve this information is by using metadata and not folder names. The important stages or categories should be keywords. Even the event itself should be a keyword. There are many advantages to using keywords and other metadata to store information instead of putting it into folder names.
Thanks for you prompt reply. I do not use the Cloud as I am dealing mainly with archival data for limited use and do not have a large ongoing production. I am new to lightroom and have not yet used Key words and certainly am not familiar at all with them used hierarchically. I plan to export the files from lightroom into a similar database and I am worried that key words would add to the difficulty for people just scrolling through files of interest. I could imagine words such as pre event, event , post event, reception, celebration might be general but it would be difficult to associate it with prewedding dinner, wedding ceremony, reception, opening presents, gathering of friends and family etc as all of these would be kept under the titles of (wedding between a and b) in (april) in (2021) as one example. That is how it is stored at this time outside of lightroom.