I imagine it could end up being very similar to Live8. Bon Jovi will either go on first or second so as to ensure they'll be seen around the world when the other broadcasts end and the US one follows or they'll close the show. If they're not the closers I would bank on them being the openers.

And for UK and Ireland viewers, like Neil said it's on the BBC but again like Live8 I would assume it will all be interactive and you'll be able to choose which concert you want to watch.

I'm in work all day Saturday so I'll miss it