Re: Picking Up Music in Kenya
You might want to read:
African Rhythm and African Sensibility: Aesthetics and Social Action in African Musical Idioms by John Miller Chernoff. This is a pretty good introduction and indepth study of some African drumming (not Kenyan).
BTW, I am not sure if djembes are a traditional Kenyan instrument. That said, you might learn about the differences between high and low quality hand drums so you will be able to make a smart purchase while you are in Kenya.
Have a very nice trip.