2018 Ticketfly (Eventbrite subsidiary) — site defacement / criminal hack; ~27M accounts in HIBP-style tallies

Days before June 2018, Eventbrite-owned concert-ticketing subsidiary Ticketfly suffered an intrusion that took services offline, drew ransomware-style public messaging, and—per specialist and breach-researcher databases—exposed tens of millions of user accounts with email, physical address, and phone fields in leaked tables. Eventbrite had acquired Ticketfly in 2017; the incident is commonly catalogued under the Ticketfly brand but materially sits in Eventbrite’s corporate lineage for platform risk history.