vishnu-2006-cloud/Vishnu18-event-booking ? reverse-engineered prompt

Build me a full stack event booking app for Vishnu where people can sign up, log in, browse upcoming events, and book a spot بسهولة. I want two types of users, regular users and organizers, so organizers can create and manage events while normal users can see events, book them, and view their reservation history. Please include secure login with JWT, password hashing, and make sure registration and login reject empty usernames or passwords, trim extra spaces from usernames, and block duplicate usernames.

The app should have a clean React front end and a Node and Express backend with MongoDB for storage. It should also let users export their booking history to Excel. Keep the setup simple so it can run locally with a frontend and backend, and make it ready for deployment with the frontend on Vercel and the backend on a service like Render or Railway. If you need to check current docs for anything, feel free to look them up online.