Event Sign-up

Event sign-up transforms events from informational entries into participatory records, enabling coordinators to plan for attendance, manage capacity, and produce accurate participation data for reporting. For organisations running group workshops or training sessions - particularly HLF's course administration and Blindeforbundet's mentorship workshops - knowing who has committed to attend is operationally critical. Participation records also feed into the Bufdir reporting pipeline and coordinator team reports, increasing the completeness and credibility of grant submissions. Without sign-up, attendance data must be collected manually after the fact, reintroducing the paper-and-Excel burden the platform is designed to eliminate.

EventDetailScreen renders the full event record fetched from EventRepository and surfaces a sign-up / cancel toggle button driven by EventSignUpService. Sign-up posts to the REST API endpoint `/api/v1/events/{id}/registrations`; the response is stored in EventRegistrationRepository backed by the local Drift database. Optimistic mutation: the button state flips immediately and the mutation is queued in the outbox. On sync failure the state rolls back and an error toast is shown. The coordinator participant list is a separate screen (WorkshopParticipantListScreen is reused where applicable) that paginates registrations from the API. Push notification on successful registration is dispatched server-side via PushDeliveryProvider.