Yes, Catholics traditionally abstain from eating meat on the eve of Christmas, which is known as "Christmas Eve." This is part of a broader practice known as "Lent" or "Lenten observance," which includes abstaining from meat on Fridays during certain seasons. The practice of abstaining from meat on Christmas Eve is not a strict requirement, but it is encouraged as a way to focus on spiritual reflection and preparation for the birth of Jesus. Some Catholics may also choose to fast or participate in other devotional practices on Christmas Eve.