A large number of 1972 shows are being torrented on etree and when I saw the Radio Luxembourg show I realized I knew nothing about, so I googled to see what I could find. Wikipedia had a great history of the radio station which broadcast in English and was the most popular station in Europe for decades and is credited with being one of the first European stations to broadcast rock and soul music and helped popularize that music throughout Europe. I also came across a couple of articles which had anecdotes of the Grateful Dead's appearance.
http://le-jeudi.editpress.lu/Forum/1461.html The second one is in Norwegian http://www.nrk.no/kanal/nrk_p1/1.6379873 Here's the English translation as done by Google http://translate.google.com/translate?hl=en&sl=no&tl=en&u=http%3A%2F%2Fwww.nrk.no%2Fkanal%2Fnrk_p1%2F1.6379873 This second article makes me curious whether the current name for the venue is correct. Theatre Hall doesn't seem quite right. It seems the name should include Radio Luxembourg since it was in the the building where they broadcast.