Could be some people just want to break a world record or Montréal team is actually that popular...
The record attendance for a professional women hockey match was broken twice this season so far and Montréal was the opposite team both time. First time was against Minnesota who play at the same place as the Wild. The second time was a Toronto game (Feb 16th) against Montréal (in the Flames Saddledome) which now hold the record attendance for all women hockey match (not just professional) which was owned by Vancouver Olympic gold medal match.
Detroit, Philadelphia, Chicago, St-Petersburg and the Bell Center in Montréal are the only place where the record can be beat again. And after the Bell Center you are pretty much set (SKA arena in St-Petersburg has a few more seat apparently