Hi Carlos,
More likely 'not enough astronomers'
Personally, I would LOVE to try and host such a Seminar here in Scotland, but it would have to be located down next to the Scotland/England border, just because that would be the only way we could hope to attract enough attendees.
Even then, I do not think that a location so far north would work. Remember, we are talking about a 'European' workshop here, not a 'UK' workshop - and despite what our Government would have you believe, the UK is NOT the centre of Europe.
A 'parallel' scenario might be for the South American Workshop to be held in Punta Arenas, or Ushuaia. Yes, it could be done, but who would be able to attend?
Cheers,