The person of peace is the one who will open up the harvest to you, so it is very important that we learn to recognize a person of peace. It helps if we have a mindset where we are always looking for such a person. The Lord delights to answer the prayer, "Lord, lead me to a person of peace for this harvest field."
The answer comes in verse 7 of Luke 10. Stay in that house, eating and drinking whatever they give you, for the worker deserves his wages.
A person of peace offers you hospitality. What does that look like in today's society? You may not get invited into a home (although in my experience, that is not uncommon). Let's say you have just started a new job, and after you've been there a few days, the lady in the office who everyone seems to revolve around says to you, "Some of us from the office go out for drinks on Fridays after work. Would you like to join us?" What has she done? She has offered you hospitality. She's opening up her circle of friends to you.
So what do you do? You could say, "Sorry, I don't drink. Not this time." In which case you've closed the door on a great opportunity. Or you could go and drink a beer (or a soda) and get to know the people in your office at a social level. She has opened up the office to you.