I recently went on a site visit, looking at venues for a customer event.  Whizzing between venues, it was helpful to have a list of key points to score the venues on - from cost, to location, to atmosphere.  

But as this list from venuesworld shows, last but not least is the flow, that all-important movement around the event space.  Experience has to be the number one part of what makes an event special and memorable - and will always be top of my list when working with a client to select a venue.