Dan, the thing to know about M&M is that it grows when the reletive humidity at a surface reaches 70%. As air is chilled by contact with the walls the reletive humidity increases. Whether the humidity at the wall reaches 70% is a function of the ambient humidity and the wall temperature. A psychrometric chart will tell you what the reletive humidity must be to stay below 70% if the wall temperature is known.
Circulating the air in the room won't change the humidity level. Exhausting air will just cause replacement air to be drawn from somewhere; and if you cause depressurization it will increase the amount of water that migrates in from the walls (if that is a source, and it probably is).
There are really only two choices, raise the temperature of the surfaces or lower the reletive humidity of the air. Since you want the room cold that just leaves lowering the humidity. Whether you can do this by ventilating depends on the temperature and humidity of the air you exchange with. A dehumidifier is another possibility.