Photos: March on Prophet Muhammad Birth celebration held in Kano, Nigeria

Islamic Unity Week is a period of one week between Rabi' al-Awwal 12 (Prophet's birthday according to Sunnis) and Rabi' al-Awwal 17 (Prophet's birthday according to Shi'as). This period was named as "the Week of Unity between Shi'a and Sunnis" by Imam Khomeini on November 1981. The idea of naming this period as above was given and celebrated for the first time by Ayatollah Khamenei in 1978. In some Islamic countries, some programs are held in order to bring unity between the two schools. (Wikishia)