In available light situations it might be an idea trying different films.
Skin tones can become somewhat flattened if susceptibility in the red part of the spectrum is high - that is the case in most films recommended for available light as both the sun in the evening and the bulbs at night are lying in the red part. These films are flat curved and tend to be low in contrast.
In clubs, I have nevertheless made good shots with such a film, (cheap) Classic Pan 400 by J&C / Fotoimpex.
http://www.jandcphoto.com/index.asp?PageAction=VIEWCATS&Category=54
First (at ISO 400), I was disappointed by the flat skin tones and the overall low contrast. When I pushed the film to ISO 800, the results were good and not too grainy at all, rather with a "vintage" touch.
I know that this is somewhat contradictory to FrankS's recommendation, and I have no darkroom experience, but for an amateur my results seemed ok.
Filters do not seem an alternative to me as too much light gets lost for available light situations, IMHO.
So try different films, perhaps in one situation with two camera bodies in order to have direct comparison.
Jesko
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Minox 35 GL, Leica III: 2/5 Summar, Contax II: 1.5/5 Sonnar + 2.8/3.5 Biogon + Tessar 4/13.5, Taxona, Ikoflex I, ICA Ideal 111, Nettar 515/2, Contessa LKE
2006 AD
800 yrs Dresden
80 yrs Zeiss Ikon
...and Frauenkirche rebuilt
http://www.frauenkirche-dresden.org/