An event is described as
standing room only when it is so well-attended that all of the chairs in the venue are occupied, leaving only flat spaces of pavement or flooring for other attendees to stand, at least those spaces not restricted by occupancy by
fire codes for ingress/egress of crowds. Some venues issue standing-room-only (or
SRO) tickets for a reduced cost since it can become very uncomfortable to stand through the course of an event. However, some fans actually prefer standing-room-only tickets as the crowds that gather can be more active than people who are sitting down for much of the event.