We've basically been playing Where In The World Is Carmen Sandiego? this week, but with Bono as the main character instead. And it turns out, Bono's practically been on tour in Africa for the past week. Here's what we've been able to figure out about yer man's travels.
January 7, 2012 - around this date, Bono was in Ghana with Jeffrey Sachs and others involved in the ongoing humanitarian work in Africa. Bono visited schools and hospitals/clinics. John Mulholland of The Observer was along and wrote about some of the trip today. There's also a matching photo album from The Observer, and a couple photos include Bono.
Around this time, Bono and his crew also met with visiting U.S. senators, and there's more about that on The ONE Campaign's blog.
January 10 - Bono, Ali and a man named Renzo Rosso (founder of fashion brand Diesel) were in Gulu, Uganda, to visit the offices of Mend, an organization that sells fashion bags made by local women. Mend posted on Facebook about Bono singing "Amazing Grace" to a seamstress named Grace, and Mend later posted a few photos: here, here, here and here.
January 13 - Bono and Ali attended the Festival du Music in Timbuktu, Mali. (see photo above) This article (in French) explains that security was high at the festival because of al-Qaida activity in the area (tourists were kidnapped and killed in November). The article's Google translation also says that Bono appeared on stage with the African band Tinariwen, though it's not clear if he sang or just spoke to the crowd. Here are some more photos from the festival.
UPDATE: This article (also in French) does specifically say that Bono sang a song at the Desert Festival with Tinariwen.
UPDATE #2: According to Afropop, Bono sang a 15-minute song with Tinariwen and Bassekou Koyate. The Telegraph has some brief video that includes Bono singing with Tinariwen as well as enjoying the festival in the crowd.
UPDATE #3: Via @scatterolight, here's another video with footage from the ORTM TV channel.
UPDATE #4: Here's more video from Bono's performance, this one from an audience member.