"The whole world is a stage!", maintained William Shakespeare. The Seeham theatre maker utters something unassuming and says: "The whole lake is a stage!" Since 1997, open-air theatres built in the water are the setting for theatre, concerts and cabaret performances in summer. The summer festival begins with the "Water Art Festival" at the end of May, where over 200 musicians and artists of the Salzburg music school and from Seeham and surroundings take part to the theme of "water".

The highlight annually is the "groups own" production of the Seeham Sea stage theatre group:

• “The spendthrift” by Nestroy under the direction of Matthias Hemetsberger was at the beginning (1997)
• The “Brandtner Kaspar“ under the direction of Ossi Korber
• Careless clover sheet – play by Johann Nestro in 7 picture productions: Matthias Hochradl
• Noise in Chiozza (Goldoni)
• Carlo Goldoni “Mirandolina” the landlady – comedy in 3 acts “Dragon thirst” by Felix Mitterer
• “The Tempest” by William Shakespeare
• Ferdinand Raimund: “The barometer maker on the magic isle”
• “The Servant of two masters” by Carlo Goldoni
• „Amadeus“, play by Peter Shaffer – Mozart year 2006
• "Everyman", play by Hugo v. Hofmannsthal, 2010
• "The naked madness", play by Michael Frayn, 2011