The Tablighi Jamaat religious gatherings take place in India, Pakistan and Bangladesh.
For the Geo Quiz, we're looking for the name of the village in Pakistan where one of these gatherings just took place.
Millions of Muslim men attended what's been described as a "kind of" Woodstock — minus the sex, drugs, and rock'n'roll, of course.
So, can you name this town in the Punjab province of Pakistan that was recently transformed into a holy city?
The answer is the village of Raiwind. Lisa Mullins talks with reporter Matthew Green of the Financial Times.