There is music in the air. The smell of grilled food mingles with that of draught beer. Smoke from charcoal rises above Parc de la Mar where a diverse crowd of people is enjoying themselves and the summer vibes.  My first encounter with food trucks was years ago in New York. Then I got to know the street food festival in Vancouver and fell in love with the unique atmosphere right away. In Barcelona, Van Van Market has become the most popular food truck event. This weekend a special edition of…