"Morgans" wrote:

It is impossible to know about attendance for the whole
week,

It's not impossible. They use convention management
software which was a finalist in Microsoft's annual world
Windows competition, with awards handed out by Gates himself
at COMDEX. I'll assume that the simplest thing that
software does is tally up the number of daily tickets sold.
Then just add the freebie tickets given out, like to media
and exhibitors, for total attendance.

Fred F.