How many fans on a concert?

Okay, I basically am starting a petition for them to tour atleast once in my country.
I need to know what the goal of the petition should be, since that would be a nice way to convince the band.

How many fans usually attend a sold out (in terms of tickets) concert? Just a rough idea...

 

Maybe 20,000 in most US venues.

 

O2, London - 23,000


...and it looked pretty much full to me on Wednesday.

 

Depends on the venue.

 

I'd say a petition of 10,000 would be good enough. Good luck!

 

10,000 isn't happening!
Thanks anyway..I'll save this one for future. We'll need a fresh petition go 10,000 in a couple of months, whenever they go on a world tour again. What do you guys think? Five to ten years?

 

I remember it was 50,000 in shanghai, 2009