The holiday of Bayram starts on Tuesday

Our favorite grocery store, Kipa, makes buying a Bayram sacrifice easy.

From www.allaboutturkey.com:

Eid-ul-Adha, Kurban Bayrami in Turkish (the "Feast of Sacrifice") is the great festival of Islam. It is also known as Baqri-Eid (the "Cow Festival") because its most important feature is the sacrifice of an animal (cow, goat, sheep, or other appropriate beast) in commemoration of the ram sacrificed by Abraham in place of his son. In Muhammad's time a camel was usually the animal sacrificed. The command to perform sacrifices is given in Surah 22.36 and although no specific day is fixed in the Qur'an the sacrificing of animals was already practiced on the last day of the pilgrimage by the pre-Islamic Arabs and the institution was duly retained. A special prayer, similar to the Eid-ul-Fitr prayer, is also offered on this day before the animals are sacrificed.

Narrated Al-Bara: I heard the Prophet delivering a Khutba (hutbe) saying, "The first thing to be done on this day (the first day of 'Id-ul-Adha) is to pray; and after returning from the prayer we slaughter our sacrifices (in the name of Allah), and whoever does so, he acted according to our Sunna (traditions) " (Sahih al-Bukhari, Vol. 2, p. 37).

Every Muslim home is obliged to offer a sacrifice on this day. The meat may be eaten by the family but a distribution of a generous share to the poor should also be made. As the two Eids (bayrams) are festive occasions, it is unlawful to fast on these days. Fasting on Eid-ul-Adha (Kurban Bayrami) would, in fact, defeat the whole object of the festival for food is to be eaten on this day with a cheerful heart in remembrance of God's bounty and provision for mankind. Umar once said:

The Apostle of Allah (may peace be upon him) prohibited fasting on these two days. As regards Id al-Adha, you eat the meat of your sacrificial animals. As for Id al-Fitr, you break (i.e. end) your fast. (Sunan Abu Dawud, Vol. 2, p. 663).

The name commonly given to the Eid sacrifice, qurbani (kurban), seems to have similar origins to the Jewish "Corban", meaning something set apart for God (Mark 7.11), and is probably derived from the Jewish word. Both Eids (bayrams) can last for two or three days but the prescribed rituals and prayers must be performed on the first day of each festival.

I'm just not sure exactly what happens after you purchase the
animal you want to sacrifice.