Each year the association Barnastresc organises this nighttime walk through the city to celebrate the arrival of summer. The route is 11km, stretching from the Forum to the Pg. de Sant Antoni and there is a maximum time limit of three and a half hours to complete the course. If you want to take part, just turn up with a torch at the meeting point (Pl. Fòrum 1) ready to get walking at 9.30pm.
See here for more information.