Third Time's a Charm

Okay, if you look closely you can see the words previously posted on this blue surface. It reads "banqueting hail". Someone clearly knew this was the wrong message and decided to make a correction. However, the corrected message is confusing in itself. Does "large small" simply mean average sized? Or are they still making up their minds on the size of the room? Most importantly, I wonder how long it will be before someone decides to fix it for a third time. As they say...third time's a charm!