Official Old Man
Uckfield Seagull
There is a system at the Oscars (Hollywood not Garcia) where there are stand bys in the wings who replace the stars when they leave their seats for a comfort break/fag. That way no seats show as being empty on TV. We could do this with say 1000 in the concourse waiting. As someone leaves a standby leaps in to the seat. When the original holder returns the standby looks for another empty seat. Standbys will be recognised with a wristband.