and the question is debated widely in the Spanish blogosphere. Helpfully a blogger already has put together a collection of American posters inviting to similar events.
The link is here.
If the authorities in Munich thought as the councillor in Avilés does they would have to impose dress codes on the waitresses there...
All of this might be part of what Javier Marías sees as a growing trend in Spanish society of prohibiting everything that you do not like. There certainly is this trend but a lot of things they want to prohibit I would prohibit, too, e.g. smoking in restaurants, bars and other public places or bull fighting in Catalonia (I would prohibit it in all of Spain, too).