But is it good that there is so much concentration on one city, and one that is expensive and overcrowded? On an international basis, the "greater audience" approach would mean everything of international importance would be held in China! And I'm sure that in other countries you don't have this concentration of Exhibitions on the capital. It's not as if these exhibitions put on by the British Museum or the Tate or the Science Museum travel around the country. Even where the London museums and galleries do have "outposts" they're not all that well sited. There are four Tate galleries, two in London, one in St Ives (Cornwall), 420 miles away, and one in Liverpool. St Ives has a population of 11,165! The Liverpool gallery couldn't be less central for the north of England, why not Manchester? There are "branches" of the National Portrait Gallery in Wales, Somerset and near York, but the accommodation for these is provided by other organisations, mainly the National Trust.
Only if you live in London, Martin. And a museum of coal mining in London? A museum of shipbuilding there? I think not.
Civilisation doesn't stop at the Watford Gap (not when you're travelling north, anyway
), nor does culture and entertainment nor art. And as for the countryside, well best keep it quiet or we'll be flooded out by visitors from London! 
Brasil is a big country. When we think in expos, we think about main cities, specially (right in this order) Sampaulo, Rio and Belo Horizonte, and (in any order) Salvador and Recife (Northeast region), Brasilia (the DC, central region), Porto Alegre and Florianopolis (South of Brasil) ... Noone thinks about anything in Manaus (Amazonia), but that foreigners have been accused of being buying it and it to be against the law (...). In my view point, we (Portuguese American) didn't accomplish colonization. I don't consider Amazonia well colonized, because Brasilian people don't want to go there ... It's different with California, in the US. People at least say that it might be nice to see the Golden Gate ... But I'm straying completely ...
In Rio, one nice place to make an expo of Playmobil would be CCBB downtown. (Centro Cultural Banco do Brasil.) But it would/will (ever?) go to Sampaulo first, as most everything in Brasil. Sampaulo is very (economically) attractive, they offer good conditions for anything & (most) everything.
To think an expo in a little city would lead me to think about Petropolis, in Rio de Janeiro State mountains, which is an important town because, when the Portuguese king came to Brasil (because Napoleon had invaded Portugal), one of his homes was at Petropolis and, since then (1808, we're in cerimonies of the bicentenary ...) Petropolis became an important place.
There are other places ... But I'd stray too long in Brasilian History and Geography, and I believe it isn't the point here ...
G.
