Get a haircut, polish your shoes and clean up your nails. Do whatever you need to do to look highly presentable.
Turn your phone to mute.
Remember your table manners.
Smile and relax this is supposed to be a nice social experience.
When ordering food keep it simple with minimal to no substitutions.
Be polite to the wait staff. Nothing says arrogance like being nasty to the people serving you.
Only order an alcoholic drink if the potential boss orders one. Then keep to one drink max – it is a business meeting.
Let your potential boss lead the conversation but have a few good questions to ask.
Enjoy the experience and get to know your potential boss. Remember you want to find out if you can work with this person as much as they want to find out about you. My theory on dinners is they are making sure that if you all are stuck in an airport for 6 hours you get along well!