I built this site from scratch using JAMstack - NextJS, Contentful, Sass, MaterialUI

The RSVP service is basic and is using a supabase PostgreSQL DB

The authentication is built with NextAuth plain credentials

It has CI/CD with Github Actions, Cypress, Jest Tests, and Vercel Deployment

It is using all completely free services (besides domain hosting)

Let me know if you want to talk about it !