Maha Kumbh 2013: Stage set for the biggest religious gathering
The largest festival crowd ever recorded was at the Kumbh Mela festival in India in 2013, where an estimated 30 million people gathered.
aCDC
The largest crowd to ever witness an inauguration is estimated at 1.2 million for Lyndon B. Johnson.
It was Chelsea in 2004 there was a crowd of over 80,00 people.
According to multiple estimates, Barack Obama had the largest audience at a presidential inauguration and the largest of any event ever held in Washington, D.C., with 1.8 million in attendance.
The highest attendance for an Iron Maiden concert is something I couldn't find, but I would guess that it was at the 1988 Monsters of Rock Festival, which was approximately 107,000, the biggest crowd in the festival's history.
110,000
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The largest comedy festival in the world is held in Edinburgh, which is in Scotland, United Kingdom. It is called the Edinburgh Fringe Festival.
The festival of the fruits is the largest festival that can be seen from space. It celebrates the curvature of the banana. It is held once every 50 years and the next festival is in 2012
mj
Wrestel mania
The largest crowd for an MMA event was Pride "Shockwave" held 8/28/2002 in Japan. The crowd in total amounted to 91,108..