Just like in Lille ( north of France city)
during the famous " braderie" carnival taking place the 1rst week of September during 48 hours;

a great mussel's white wine stew served with french fries...
Under reservation only,
please let us know 1 or 2 days in advance.

1 L per person of mussels, french fries: 3000 yens.

http://lilletourism.com/info-3-90-0-fr.html

http://www.graine-du-savoir.org/les-collections/braderie-de-lille.html

http://nord-pas-de-calais-picardie.france3.fr/dossiers/33459653-fr.php