traditions

The kola nut, origin of the term "cola," plays a huge role in Ibo culture and is used in welcoming and honoring guests. It is featured many times in Things Fall Apart
Traditional marriages (Igbankwu) are huge ceremonies involving the bride and groom's families, as well as extended family and villages. After the acceptance of a proposal, the bride price settlement (Ika-Akalika) can take place. The wedding takes place at the bride's compound
Yams (foo foo) are incredibly important to the Ibo. Most food is served with yams. Soups mostly consist of palm oil
Age grades are important, formed by people three to five years in age. Communities are split up according to age grades
Masquerades (Mmanwu) are planned in keeping with village calendars, and typically are associated with spiritual elements
Traditional rulers (Igwe or Eze) are nominated by the community, who maintains rule for life and distributes titles
Rank was displayed by titles, earned by accomplishing something. They started with Nze and went up to Ozo or Ichie, both of which were second only to the Igwe
Conversation as an art form carried high regard with the Ibo, and proverbs were considered "the palm-oil with which words are eaten" (Achebe 4)

then

Traditional customs (i.e. funeral rites, marriage ceremonies) took precedence
There was no single leader or chief, as in a monarchy, and instead the village (usually around 5000 people) made up the political unit. Villages were lead by a council of elders, heads (by lineage), and wealthy men
Age groups had to prove themselves by protecting the village against enemies

Funeral rites are usually handled through the church
Traditional marriages still abound, but typically are followed by or integrated with a church ceremony
Yams and kola nuts are still a major part of the Ibo diet and culture
Masquerades and festivals (such as the New Yam Festival) still occur