Initially, another person was involved in this project and, according to the customer, a couple of people took on it.
What had to be done?
The first and most important is the calendar. He is both a calendar and at the same time a filter of posters. Initially, it was just a task to clearly filter by the selected dates, but later everything returned that the filter would be a little more complicated. It will move the posters that are closer by the date of the selected user to the beginning, and, on the contrary, move the rest closer to the end.
The second most important task is to complete all types of posts and, in general, to tidy up the post templates and their styles. Since there were only semi-empty files from the templates for the records.
The third task is to finally put everything in order following the layout, because there were also problems with indents, fonts and adaptation for mobile devices.
The decision was made that I will work with what was, but still I will redo some points. In particular, since I redid the creation of custom posts and meta fields for additional information. The acf plugin was chosen to create meta fields due to its convenience and simplicity.
The site itself does not use any constructor, an exclusively self-contained template with a minimum number of plugins.