Apparently most mass shootings occur in gun free zones, so really the concept of them is very stupid.
No, apparently they don't. The ones you hear about most often occur there, but that is not where they most often occur. That is media hype. What is commonly missed are the localized mass shootings that don't occur in public areas that fail to make national news or that are in public areas but fail to garner much attention because they are not particularly unique. As near as I can tell, most mass shootings happen in private residences, usually but not always are composed of multiple numbers of family members. These get written off by the media as domestic problems and usually carry little national newsworthiness.
Here are just a few examples from this year and you may not have heard of any of them.
1 Jan 2013 - 4 shot at a house party, McKeesport, PA
Jan 2013 - teenage shoots and kills 5 in ABQ home
Feb 2013 Mardi Gras Bourbon Street mass shooting, 4 shot
Feb 2013 - 5 shot and 1 killed in a home in SF, CA
This morning, Feb 16 2013 - 5 shot outside of a club in Columbia, SC