recinto is usually a shortened name for "recinto ferial" , this is, the facilities building for fairs of, i.e. Computer Technology (SIMO in Madrid), Cars (salón del automóvil de...Barcelona, madrid....), and so on.

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Note added at 7 minutos (2007-06-01 13:43:19 GMT)
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also some of these fairgrounds are used for Music concerts, and other events which
see their website: http://www.lafarga.com/

also, instead of Fairground, can use Activities Centre, as they say in their site