Sant Jordi

In Catalonia, April 23rd is a special day: Sant Jordi (St. George), who killed the dragon in order to get to his princess. In remembrance of this special event, on this day women receive a rose from their husbands, fathers and friends, while men get a book.
But, knowing that most people realize their rose-and-book-duties on the very day, the rose-selling and book-retailing services are prepared: all over the town you can find loads of book and flower stands.Of course the Catalan colours need to be present at ALL times. As well as the usual more radical groups like "one language - one country", "Catalonia claims independence", etc. Most people smile and keep on picking up roses.
By the way, you don't even have to decide on the colour: