I came across a Norwegian site which is dedicated to the venue Drammenshallen in Drammen, Norway, and the many concerts that have taken place there, including DS in 1981 and 1985. The site is:
https://www.meteorittmannen.no/elementer-28/1985-10-22-23-dire-straits . It contains a number of scanned news clippings, amongst others this one which caught my attention:
Edit: I decided to edit the woman's last name in the translated text so it won't come up in the search engines.

I scanned the text and ran it through Google Translate:
Mark Knopfler fell for Siw from Solbergelva
DRAMMEN: First a hearty dinner, then a free concert in Drammenshallen and finally a nachspiel with Mark Knopfler. The meeting with the Dire Straits members at Bragernes Torg on Wednesday morning turned into an unforgettable stay with one of the world's most famous artists. When Mark Knopfler left Fornebu yesterday, Siw B. (21) from Solbergelva had to promise to meet him again in London for the big Christmas concert.If Siw had wanted to, she could have accompanied Mark Knopfler to Stockholm yesterday, but her job at the reception at Müllerhotell in Drammen prevented her from doing so. To be on the safe side, Mark Knopfler gave her a worldwide free pass to all his concerts, as well as the phone number at home in London- I got a very positive impression of the band, says Siw B. to DT-BB— Mark Knopfler was particularly nice, and we chatted and had fun during dinner in the luxurious Dire Stralts bus before the concert on Wednesday. Afterwards, I joined -The Royal Family-, as the closest friends of Dire Straits are called, to the concert in Drammenshallen and ended the evening with the band. I was pleasantly surprised by how the fellows behaved. No alcohol was touched before the concert, and the conversation that took place was very pleasant. Mark could also say that he was very uneasy before the first concert on Tuesday, and would have preferred to cancel the show and sleep in after the long and tiring flight, she says. Only a small number of the audience discovered during Wednesday's concert that Mark Knopfler dedicated one of the songs, which he does not usually include in his concert repertoire, to his Norwegian girlfriend. Siw B. had no doubt who he meant — At least I'm not going to quit my job, laughs Siw after all the commotion her friends have started to "congratulate" her with Mark. If Siw does not take the initiative to call Mark Knopfler, then he has obtained her address and telephone number in Solbergelva. When we ask her if Mark Knopfler can treat her to a trip to London, she smiles evasively.
Mark Knopfler fell for Siw B. from Solbergelva when he met her outside Buskerudbanken on Bragernes Torg on Wednesday morning. When Mark left Fornebu yesterday, Siw had to promise to meet him again in London.