I was thinking about supportets/political activists prone to violence. The article I read mentioned nationalists were invited.The safety personnel was impressive, there was even Secret Services roaming all floors all day. I left in the morning to go to a museum and came back as they were firing the canons to prepare myself for a massage I booked at the hotel spa. I did not see much of it but it seemed to have gone well. I am enjoying it very much, love the city and actually extended my stay by one day, with the last night at a top floor room of the Novotel Centrum.