Jan, the lighting was interesting indeed. The shades of grey or blue come from floodlights outside the frame. While the 105 is less flare-resistant than, say, the Zeiss (1)35/2, it certainly behaves well at night.
Bjørn, Rawtherapee is a bit complicated indeed, and if there is a way to have preset processing, if haven't found it yet. But the results are only slightly less optimal than with LR: not bad for free software. Deserves support.