This is a result of the promoter's failure to submit payment for cleaning services for the 3-day Sonisphere festival at the "Vassil Levski" stadium this past June. This news just in courtesy of the 24 hrs daily, citing Sofia mayor Yordanka Fandukova.

"City Council won't allow any future Balkan Entertainment events to take place in Sofia until they submit payment. We have been waiting for 15 000 bgn from them ever since the Sofia Rocks festival ended half a year ago."