So, on a semi-regular basis, I have been making the trek to a FLGS on Thursdays. Thursdays is generally their Warhammer night, and I am trying to get people to consider adding Warmachine or Hordes to their game rotation. As a practical matter, this means that my Thursdays will probably be spent playing 40k or WFB and making small talk about other systems for the better part of half a year, while also trying to drum up people for Saturdays (which is our designated WM slot.)
FWIW - the store owner is fine with me coming in to play on Thursdays, in part because I do buy paints, brushes, etc, even if I have not been buying WFB or 40k stuff. But, since my GW stuff is a little lacking, I'll probably wind up buying some Skaven or Orks in the next few months, just because I happen to be playing 40k on a Thursday night instead of WM.
40k may not be my game of choice, but I will probably get more people to add WM if I am seen playing both games as well.