The Organization for Security and Co-operation in Europe (OSCE) hereby seeks proposals from qualified Bidders, for the supply, implementation, support, and maintenance of a cloud-based Software-as-a-Service Event Registration System for the OSCE (hereinafter referred to as “the ERS”), according to the requirements as defined in the Terms of Reference (hereinafter referred to as the “TOR”). Clarification Note published on 25.03.2025 The bidding documents are available for review and download at: https://procurement.osce.org/tenders/provision-software-service-event-registration-system.