@iLab Africa research institute will host a Science Hack Day on 13th -15th April 2012. A Hack Day is a 48-hour day and night event that brings together designers, developers, scientists and other geeks in the same physical space for a brief but intense period of collaboration, hacking, and building 'cool stuff'!
The website and registration pages are up. See: http://nairobi.sciencehackday.com/ and http://sciencehackdaynairobi.eventbrite.com