anubhavxdev/Event-management-system-main ? reverse-engineered prompt

Build me a full stack event management app called EventOne that feels production ready and easy to use.

I want regular users to be able to browse and discover events, see event details, register, get a ticket with a QR code, check in at the venue, and leave a review after the event. I also want organizer and admin roles with proper sign up and login, role based access, and dashboards where organizers can create and manage events, view registrations, and monitor attendance.

Please include real time check in updates so organizers can see people arriving live. The UI should look modern and clean, with a polished responsive design. Keep the current React, Node, and Mongo style setup already implied by this repo, and make sure the backend and frontend are fully connected and actually runnable.

If anything is missing, fill in the gaps in a sensible way and use best practices. You can look up current docs online if needed. Also set up demo data or demo accounts so the main flows are easy to test.