Hilary, the venue is a green area on the outskirts of Nicosia called Akropolis Park. There are caves in one area that have been converted into Exhibition/Conference Rooms and this is where the exhibits in the various competition categories are displayed. Outside the caves is a sunken area where the Cactus & Succulent specialist nurseries set up their stalls to sell their wares.
Alisdair, you may not have recognized it but these are the caves that we used in the 2009 AGM that was held in Cyprus for Mary and Oron to give their fascinating talks.