All four band members were in attendance today as Irish poet Seamus Heaney was remembered at a funeral mass in Dublin. It took place at Sacred Heart Church in Donnybrook. The Coventry Telegraph has several photos of U2 arriving (minus Adam). The Irish Times and BBC also have recaps of the mass and different photos of Bono and Ali.
UPDATE: The Irish Independent has a video montage from today's funeral, which includes all four members of the band arriving with their significant others.
The whole band was also together in Copenhagen on Sunday. According to this article in Danish, they were there for a bachelor party. There's a photo there that seems to show Anton Corbijn in conversation with Bono, while Adam and others look on. (Thx to Claus V. for the tip.)