Add photographs under events/<promoter>/<year>/<artist>/,
then run npm run build and reload this page.
npm run build
One step first
You opened index.html directly from disk. Browsers block
ES modules and JSON reads on file:// pages, so the gallery
cannot start that way.
cd /path/to/gallery
npm start
Start the server from this folder, then open the URL it prints — normally http://127.0.0.1:4173.
The server is already installed. No build step is needed to view the current collection.