Do you have an actual source for this data of just the pretty picture? I'll say it again nearly all of the mass shootings in the last 1 to 2 decades have been in so called "Gun Free" zones for everyone except the shooter.

Regardless of what you produce it will likely be wrong if it says anything otherwise. You are right there is plenty of info available on the internet about this.

https://crimeresearch.org/2018/06/more-misleading-information-from-bloombergs-everytown-for-gun-safety-on-guns-
analysis-of-recent-mass-shootings/

http://crimeresearch.org/wp-content/...Bloomberg2.pdf