Thousands of men travel to the city to enjoy this event's festive atmosphere. There is also has a smaller version for lesbians.
The Matinée leisure group organises this event, which attracted over 70,000 people in 2013, 80% of whom were foreigners.
The most popular event is held at a water park on the outskirts of the Catalan capital, which is attended by over 10,000 people. Although this water-park day and the frenetic activity of the night-time events attract the most attention, there are also many other daytime activities, including workshops, talks, debates and sports tournaments, such as football and beach volleyball.