It seems odd to take this as an indictment of burning man when it should be verboten to invite anyone to an intimate event DURING A PROFESSIONAL INTERVIEW. Wait until after the interview and try to know them on personal terms.... then maybe. Even that seems super sketchy as you could interpet it as tied to the interview.
Rubicon is a rather shallow river and is easy to cross by the way. But comparing menage-a-trois to a watershed event in human history deflates the risks taken by Caesar.