Take it from an actual stagehand, it's front of house irregardless of venue. I'm sure there are different names but if you work in the industry, that's front of house.
It's not actually a mistake. It's a word that has been in use for 200+ years with its first recorded use in 1795. It's controversial, but it appears in dictionaries and is a synonym for regardless. Love it or hate it language changes with time and when enough people use a word it becomes a part of the language.