From 6th to the 8th July 2007 the official opening ceremonies took place in the Ottersbachhalle in St. Peter a. Ottersbach (Styria). Due to its capicity of more than 1000 people it is the biggest hall of the district Bad Radkersburg and it offers a variety of sportive and cultural possibilities. Vatter was entrusted with the planning of roomacoustics and event-technic.

Mayor Franz Thuswohl: "Nowadays the audience is spoilt of technic - this fact emphasizes the importance of acoustical and technical equipment in a multipurpose hall. In the Ottersbachhalle we realized this within reasonable bounds."