The question "Keeping Kosher at a secular company" asks about food issues on the job in general. This question is focused more narrowly on "unbalanced" situations: situations where there's an imbalance of power.
A junior employee, such as an intern, works at a large company where the senior management sometimes invites junior employees to lunch. Such meetings are primarily of benefit to the invitees, who can gain valuable advice and networking opportunities as they start their careers.
How should the employee in this situation respond if the invitation is to a non-kosher restaurant? On the one hand, the lunch offers an opportunity and it seems impolite to decline a higher-up like a company president. On the other hand, it also seems impolite to sit in the restaurant and not order anything, and this may make a bad impression on those present. I know there may also be the issue of maras ayin from going into and/or eating in the restaurant.
What is the best way to handle this situation?