I was at the Easterhouse event and really enjoyed it. I felt that the musicians did interact with the environment and utilised the space available - look at the more resonant enclosed corridor that Ikuro Takahashi used for his "personal alarms" performance, so that their cumulative sound reverberated and built and echoed about...
There were a couple of security guards at the event, but I didn't see them slap anyone down, merely keep an eye on things and have a quiet word to stop anything getting out of hand. There was a group of local folks who gathered pretty much from the beginning of the event, and there was some amusing piss-taking of Tamio Shiraishi's saxophone playing in particular, but I for one thought that it added to the whole thing - interaction not just with the static surroundings, but with the people who live there every day as well. By the time we'd listened to the drumming and the saxophone and had all moved down to the above mentioned personal alarms section, from what I could see, it seemed like the local kids were getting genuinely interested in what was going on. Barry Esson, who organised the events spoke to them, explaining what the event was about, who the musicians were etc. etc. and there was no more cat-calling or interruptions. There was even a brief rap from one of the Easterhouse guys at the end, at the behest of Barry Esson, since the guy suddenly seemed quite shy.
I'll have some photos soon(ish).