from what can be read with only being able to read English, and also a fan ayumi facebook page has posted this:
"Live Streaming of ayumi hamasaki ～POWER of MUSIC～ 2011 A LIMITED EDITION on Ameba Pigg!
http://content.ameba.jp/pigg/ayu_piggdome/live/"
It does look like it her concert will be streamed on the 10/19 18:30 START