Figures from this source
- EstimateGO Fest 2019 Chicago (Niantic Labs claim): 4-day attendance 64,000, tourism revenue $120M, GO Fest Chicago 2017 per Gizmodo 'last year' (ambiguous; article Jan 2020)
- EstimateGO Fest Dortmund: >86,000 attended, tourism revenue just under $60M; no study author or method given, 2018-2019 (ambiguous)