There are 29 different events in the summer Olympics and 15 events in the winter Olympics.
Africa is not a nation it is a continent and the question is like asking how many sporting events did Europe participate in. The answer for both is zero although European countries might have been in all 302 events
It depends on what year of the Summer Olympics. In 2012 and 2008, 204 nations participated in the Summer Olympics. In 2004, 201 nations participated in the Summer Olympics.
There are 302 events in the 2012 summer Olympics
Over 300 Olympic events.