I just filter on Showtime and the objects I need are easy to find.
The lot type makes a difference too. It controls how long the place stays open and how it functions.
EDIT: I usually use Hangout as the lot type. Other particular venue lot types control opening and closing time and probably send different townies to the lot at different times so it all depends on how you want the lot to function. I've been known to change the lot type a few times to see what happens.
There is no spot for the proprietor when building in game but the proprietor does turn up if you place a showtime stage. If the proprietor fails to show after a reasonable wait I just reset the stage and a new proprietor is allocated.