In Poland, and here in America for many with Polish heritage, there is a beautiful Christmas Eve tradition of sharing a wafer called opłatki (o-pwaht-kee), similar to the wafer used for Holy Communion.  It happens in an informal ceremony before the family sits down to their Christmas Eve dinner.  This year, Fr Tim will be blessing opłatki at the 4:30 PM Mass, the vigil of the fourth Sunday of Advent, December 21.  Envelopes containing 4 wafers will be available to pick up after each of the Masses that weekend (1 per family, please).  

Opłatki – A Polish Christmas Tradition
Derived from the Latin word oblate, opłatki is unleavened bread that is shared in Polish homes at Christmas. The word opłatki itself means "Angel Bread" and is also seen spelled as "opłatke" or "opłatky." The correct Polish pronunciation is o-pwaht-kee. This is the plural form of the word. One wafer is called opłatek (o-pwah-tek).  
The wafer is typically a rectangle about four or five inches long, embossed with a Christmas scene of the Nativity or the Blessed Virgin Mary holding Baby Jesus. It is made of flour and water, pressed thin to resemble the wafer used in Holy Communion. Associated with the Mass, but distinct from the Eucharist, opłatki have long been considered a sacramental.  White wafers are for the human members of the family; other colors are for family pets and farm animals. It is customary to have the wafers blessed by the parish priest.
Christmas Eve marks the end of Advent. Traditionally, in days past, fasting and abstaining from meat during Advent were commonly practiced.  Christmas Eve meant the last day of fasting, so the dinner was typically meatless. The menu might have included items such as beet and/or mushroom soup, fish, pierogi, and stewed fruits. 
The informal ceremony of the opłatki begins with each family as dusk falls and the youngest child spots the first star appearing in the night sky.  At the start of dinner, just after grace, the male head of the household takes the wafer and expresses his hopes for his wife (should he be blessed with one) in the new year. He might wish her good health, or success in a specific endeavor.
The wife breaks off a piece of the opłatek and eats it. She then reciprocates the good wishes and shares the wafer with her husband, and the ceremonial sharing of wafer and good wishes continues with older relatives, guests and children, starting with the oldest.
Alternatively, each person present receives a whole wafer or a large piece of one, and they all go around the table with good wishes for one another simultaneously.  Each greeting concludes with a hug & kiss and a felicitation for a joyful feast.
This informal tradition is a beautiful way to come together with loved ones to let them know we care about them, we see their everyday successes and challenges, and we hope the best for them.  The lesson of this custom is that the family, the domestic Church, must be united with the bonds of charity. It reminds us that we do not seek salvation alone, but with others, especially our family. We should help each other obtain salvation, always bearing Christ-like charity toward one another. When we are united in charity, we are joined, by the head of the family, to the unbroken links of One Body, One Bread, One Christ, and One Church.
The above has been compiled from articles on zieglers.com, npr.org, and catholiccompany.com      
More: https://aleteia.org/2018/12/19/the-beautiful-polish-tradition-of-breaking-bread-on-christmas-eve/