Here's some mass shootings from my memory.
-San Ysidro CA 7/18/84 "McDonalds Massacre" James Huberty?. don't recall death toll, but it was in the 20's, Uzi carbine, handgun,etc GUN FREE ZONE- via CA law
-Stockton, CA 1/17/89 Cleveland Elementary School, Patrick Purdy, 5 children dead, used semi auto AK47, this one responsible for fed GFSZ law and 1994 EBR ban. This is the one that grabbed my attention as a 16 year old and got me obsessed with guns/gun issue first time around. Damned media wouldn't stop talking about it and EBR's. GFZ via CA law
-Killeen, TX 10/16/91 Luby's Café, George Hennard Jr, 24 or so dead, Susan Hupp survived, got TX ccw law in, used handguns GFZ via TX law at time
-Various more minor school shootings in mid 1990's, all GFZ's via federal law
-Columbine 4/19/99 during midst of federal EBR ban, yet used a semi auto Tec 9 among other guns, GFZ via federal laws, though had 1 armed security guard who wasn't trained well enough or was inept ( or something)
-VA Tech- 4/16/07 32 dead, 2 handguns used, GFZ via school rules
-Omaha Mall- 7 or 8 dead, semi auto AK style, Dec 2008, mall was posted as GFZ
-Gabby Giffords/Tuscon AZ- only one of these NOT in a GFZ, but was a gathering of Democrats who apparently weren't carrying due to probable brainwashing of D party being anti gun, handgun used
-Ft Hood- GFZ except for MP's and civi cops, none were right at scene when it happened.
-"Batman" movie theater shooting, CO, primary weapon 12 ga shotgun, AR jammed, plus handgun, 12 killed, movie theater posted NO GUNS, therefore GFZ
-Newtown, 12/14/12, 26 dead, hinky from the beginning, but probably happened despite tinfoil hatters, just that there is a coverup of some sort, such as actual weapon used, and possible 2nd/3rd shooter, least transparent mass shooting of ALL of them. Possible gov't false flag event with actual deaths, used to try to push Obama gun control laws. Adam Lanza named as shooter. Sounds like he was way too autistic to even be driving a car. I have aspergers and have trouble driving and am very high functioning. Less functioning aspies most often don't even have a driver's lisc. He sounded like he was not very functioning/shut-in. GFZ federal/state laws.
-Navy Yard shooting- another GFZ except MP's and guards at gates. No MP's on right on scene while rampage was occurring.
-Ft Hood shooting 2- still a GFZ
-latest CA rampage- SoCA all one big GFZ by law