Case C-578/19: Judgment of the Court (Third Chamber) of 18 March 2021 (request for a preliminary ruling from the Supreme Court of the United Kingdom — United Kingdom) — X v Kuoni Travel Ltd (Reference for a preliminary ruling — Directive 90/314/EEC — Article 5(2), third indent — Package travel, package holidays and package tours — Contract concerning package travel concluded between a travel organiser and a consumer — Liability of the travel organiser for the proper performance of obligations arising from the contract by other suppliers of services — Damage resulting from the acts of an employee of a supplier of services — Exemption from liability — Event that cannot be foreseen or forestalled by the travel organiser or the supplier of services — Concept of a ‘supplier of services’)