- Russia - Country of Opportunities
- 3,245 people
- Russian Federation (Kazan)
The most participants in a hackathon is 3,245, and was achieved at an event organised by Russia - the Country of Opportunities (Russian Federation) in Kazan, Russian Federation, on 28 September 2019.
The hackathon took place at the Kazan Expo, over the course of 48 hours.