About 700 participants, more than 400 presenters from more than 40 countries: Yet, for Hamburg, »PSi#23« is no »OverFlow«. »OverFlow« simply belongs to the DNA of our city. For centuries, we have been managing streams of water, merchandize, traffic… We are delighted to be your host for the coming four days! We are very proud that the international science and arts association »Performance Studies international« has chosen Hamburg as a location for its annual conference in 2017. This underlines the international reputation of Performance Studies at Universität Hamburg, of Kulturfabrik Kampnagel and of the Theatre Festival »Theater der Welt«. There is so much »OverFlow« worldwide: constant news, messages, advertising — how does this affect us as humans? How does it affect individuals and societies? Thank you for seeking an answer, both in scientific and artistic ways! Enjoy a great celebration of international, interdisciplinary, scientific, and artistic performance research!