OK, you better not call the studio. Or knock on the door. Or anything like this. They don't like it and you will very likely get no response or information. Best thing is to read through the topics of the recent fan meeting, so you know about what time the fans were there and the band arrived. If fans behave properly, Bono will come out and talk to them, take pictures, sign autographs. But after all let's not forget that the studio is where they work. For them it's like going to the office. So far, they have been really nice and gracious to the fans, but they don't need to. Just take your time, go there, get some information, talk to fans and have a little patience.