The Murcia fly-in is at
http://www.murcia-fly-in.com/
It appears to be coming along very slowly. I was in contact with the developers about a year ago; despite being at all the air shows, they didn't really want to reply to correspondence. Perhaps they just wanted people with a suitcase of cash - the Spanish property market has been like that for a while.
They were developing some 700 properties around the airfield - this is more than the sum total of aircraft owners (ones that have any money, the min plot+house price was GBP 200k) in the whole of Europe.
Also a major international airport was planned just a few miles away.
This region is being heavily developed for the ex-Brit fish and chips / pint of bitter crowd.
I don't think large air parks will work in Europe. The French ones are much smaller, more expensive (GBP 400k+) but a lot nicer.