Upvote:0
The Chinese New Year, around 1.4 billion people go back to their home towns to celebrate.
Itβs a single event but they do not travel to the same destination so it depends how you define event, but if you look at it from an event point of view and ignore that its not a single destination I doubt anything else comes even remotely close
Upvote:2
Most likely this would be Kumbh Mela, which in 2013 attracted (depending on which figures you believe) up to 120 million people, including 30 million on a single day.
The full gathering occurs every 12 years, with a smaller (at least in theory) gathering after 6 years.