NAIROBI, Sept 4 (Reuters) – The following company announcements, scheduled economic indicators, debt and currency market moves and political events may affect African markets on Thursday. – – – – – EVENTS: *KENYA- The central bank to auction 91-day Treasury bills worth a total 4 billion shillings. GLOBAL MARKETS Asian shares steadied near seven-year highs on Thursday, underpinned by hopes of a ceasefire in Ukraine, though a cautious mood prevailed for now ahead of the European Centr