I know @shizzlemetimbers has that poster. He isn’t active anymore, but he posted about it here in his collection thread: Shizzlemetimbers Collection 2022 - 6 Years in the Making - #205 by shizzlemetimbers.
And you’re indeed correct that it was given at the 4th Next Generation World Hobby Fair in August 23/24, 1996. 
Roughly ~63,400 people attended that event, according to the magazine Shizzlemetimbers shows in his collection post, but you almost never see these posters available for sale.
Greetz,
Quuador