You'll need a Hacker class character for this. you can get one by turning the Camden district into defiant state by finishing every red icon mission and then the last missions that unlock after them. switch to the Hacker and roam the streets to find a crowded area of at least 8 people. adjust the angle so that you have all of them in your line of sight. hold
on a person and hold
to perform the Distract hack. make sure to HOLD the button to perform the hack across multiple targets.
EDIT: Crewdy4923 mentioned going to the Dedsec safehouse bar. there are always 8+ people there.