NAIROBI, Oct 3 (Reuters) – The following company announcements, scheduled economic indicators, debt and currency market moves and political events may affect African markets on Friday. – – – – – EVENTS: NIGERIA – Fitch’s ratings review of Nigeria NIGERIA – weekly interbank rates report: Secured Open Buy Back (OBB), NIBOR, 30, 60, 90-day GLOBAL MARKETS Asian stocks were poised for their fourth-straight weekly fall on Friday, with the regional index drifting in an aimless mornin