[Update] xxxHOLiC x Soundtheatre

[nokiirat.livejournal.com]

Tickets to the January 28 and 29th 2017 xxxHOLiC x @soundtheatre event will go on sale starting December 18th. https://t.co/cv1KGrTVlT

— seichan (@clampnews) December 3, 2016

I think there were preorder ticket sales back in October, but this is general sales. (whatever the difference may be). This is the xxxHOLiC stage event featuring the anime seiyuu.