Back in the 60's and 70's I had a 'frequent visitors pass' for RAE and would very often nip in the Pyestock gate, find a suitable vantage point and just watch the show. Just occasionally I'd go into the show area but not very often.
I remember one company that used to put out all it's unwanted brochures left over from overseas sales drives on Sat/Sun as it was a good way of getting rid of them