Five wine producer organisations come together for this event: Österreichische Traditionsweingüter (ÖTW), covering the Danube regions of Kamptal, Kremstal, Thermenregion, Traisental, Wagram, Vienna, Carnuntum and Weinviertel, who are renowned for being pioneers in the classification of Erste Lage wines in Austria. They are joined by winegrowers from Eisenberg and Leithaberg as well as the Styrian Terroir and Classic Wine Estates (STK). 2022 marked the inaugural appearance of Vinea Wachau (Vinea Wachau Nobilis Districtus), an association of Wachau winegrowers founded in 1983. The ÖTW Single Vineyard Summit therefore offers tastings from all of the key wine regions and sites in Austria, under one roof at Grafenegg castle.