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Largest attendance for a mobile videogame event

Largest attendance for a mobile videogame event
Who
Pokémon Go Fest - Grant Park, Chicago
What
20,000 people
Where
United States (Chicago)
When
22 July 2017

An estimated 20,000 gamers attended the first Pokémon Go Fest in Chicago's Grant Park, Illinois, USA, on 22 July 2017. Tickets for the inaugural live event had reportedly sold out within minutes of them going on sale the previous month.

According to reports, the event was unfortunately beset by technical issues and attendees were offered refunds.