That culture is the pivot on which all relations stand is not an overstatement. In support of this assertion, this paper presents an overview of Adamu Orisha festival on Lagos Island and its implications on economic growth. This contribution becomes fundamental in order to mend the gap in knowledge that urbanized societies of which Lagos belongs is hardly cultured. The Adamu Orisha festival, which is synonymous with EYO, is the most famous cultural festival in Lagos. Prior to 1920s, the performance of the festival were held on days as dictated by the divination of the Ifa Oracle; for convenience and economic reasons; but the reverse is the case presently. Further, there are no restrictions as to the number of times the festival could be staged even on a yearly basis. To corroborate this position, oral tradition shows that during the reign of Oba Eshugbayi Eleko, six and four performances were held in 1906 and 1909 respectively. For clarity of purpose, the paper reviews the origin, grouping, stages of activities, setting, record of performances and significance of Adamu-orisha play. Finally, it discusses the implication of Adamu-orisha on the economic growth of a cosmopolitan Lagos.