Website & project not completed yet!
libreǝvent is a free and open source event management solution that you can host on your own hardware, if you want to
It is mainly written in node.js, but, as a webapp, uses also lots of HTML and CSS. For storing the customer / userdata, you may choose between using MySQL and a JSON based custom database, such that this project may be used in more cases. Whilst it is recommended to use MySQL with this project, using the JSON based database can be an easy to set up alternative if you are not serving that many customers.