The birth of Jesus is announced first to shepherds, who were looked upon as "low class." Luke, who has a special eye for outcasts, wants us to know that such were the people who received an "engraved announcement" of the birth of Jesus. From heavenly messengers, no less.
Later in Luke's Gospel, Jesus will say: "When you hold a lunch or a dinner, do not invite your friends or your relatives or your wealthy neighbors, in case they may invite you back and you have repayment. Rather, when you hold a banquet, invite people who are poor, crippled, lame, blind." (Luke 14:12-13)
Sometimes we don't fell like the elite of the elite. For a variety of reasons, we feel more like the lowly.
Well, "This one's for us."
Christmas is our feast. It was for us, especially for you, that he came.
- Little Blue Book, Diocese of Saginaw