A sign/banner say you MUST stand up in the Yellow Fever zone, coupled with a rope down the middle of the soul stand with a sign at the bottom of it and half way up saying "<---- STANDING | SITTING ---->" Is worth trying.
Plus I think people who are sitting in the Fever half of the Soul stand should be spoken to. Seriously.
Plus we should have gone into that half with flags and stood in front of them anyway. Again, seriously.
I don't accept the whole "I paid for my seat and I don't want you standing in front of me BS."
I paid for my ticket too, and I SPECIFICALLY paid for a ticket int eh Fever Zone so I could stand. If yuo want to sit, go to the area where people bought tickets to sit. If not stand up.