Saturday, June 29th, 2019 ISL opened its doors to all ISL members, their families and friends. Retired people of ISL were also invited and staff members of the City of Saint-Louis. About 2000 visitors had been present to attend to the dynamic presentations of the very diverse research topics situated on 20 different booths. It was also the opportunity to have a look to the latest constructions and installations such as the brand-new technical complex P2 inaugurated two days before.