The daily fast is followed by evening celebrations, visiting, and eating. It includes lots of visiting and feasting. Id-al'Adha is the festival of sacrifice in remembrance of Abraham's offering of his son Ismail as a sacrifice to God. Sheep, goats, and camels are offered as sacrifices and the meat is distributed to the needy and to religious leaders or consumed. Market weight is not as important as animal health at slaughter.
Jewish holidays tend to include strict fasting followed by feasting.