Large crowds joining all at the same time. Large consumptions and an aftermath of high cleaning costs.
RVM's in venues and events locations would help on every area.
From a sales point of view, integrating the return of containers with a discount on a next purchase would simply trigger new sales.
It could also print points to be used against the purchase of tickets for future events.
The estate will certainly have less containers scattered around, keeping it safer at all times.
The ultimate goal of recycling will certainly remain the priority, but many other opportunities arise.