Impatient With Gun Debate, Parkland Survivors Embraced Activism. Parkland, Fla, Shooting (2018), School Shootings and Armed Attacks, Gun Control, Hogg, David, March for Our Lives Inc, Marjory Stoneman Douglas High School (Parkland, Fla), Florida, Parkland (Fla), Petty, Ryan, Demonstrations, Protests and Riots