As reported a couple of weeks ago, U2 will participate in the Moving Stars and Earth for Water event (from their Tampa U2360 show) tonight.
The “cities & personalities” page for U2/Tampa mentions a chat and a performance:

Guy Laliberté has a space-to-earth conversation with very good chum Bono and U2. They will discuss the uniqueness and beauty of the Earth in the solar system. U2’s performance will be supported by images of our blue planet, taken from the International Space Station.

The 2 hour event starts at 8:00 P.M. EDT and can be viewed online.