Matenrou Opera has posted on their official Twitter that Anzi will be support guitarist for a program that Music Japan NHK will broadcast on 12/12. I have no idea, but since they posted it in English, I am assuming you can either see or hear this at the site, which says that they will begin the broadcast at 6:10(am).
Also, remember that on 12/17, Music Japan Plus will be broadcasting Matenrou Opera TV, where the band will be answering questions and reading messages starting at 21:00. Remember that all times and dates are Japan time. Follow Matenrou Opera's official Twitter for updates on all band related activities. This is also where they will be taking messages for the Music Japan Plus event. Here are important sites:
MUSIC JAPAN
musicJAPANplus - musicJAPANplus -top- Jpop, Jrock, and visual kei.-
http://twitter.com/MatenroOpera
The World Clock – Time Zone Converter