Question: When was the inaugural festival for the the famous festival for mature musica fans at Caisteal Inbhir Aora? 
Sentence (from "Inveraray Castle"): Inveraray Castle (Scottish Gaelic "Caisteal Inbhir Aora," pronounced ] ) is a country house near Inveraray in the county of Argyll, in western Scotland, on the shore of Loch Fyne, Scotland’s longest sea loch.
Relevant evidence: Yes