This is something I struggled with and still struggle with to this day. I searched for a long time for a simple web app to connect my Nextcloud calendar (now Radicale), and one day, a hero who has since disappeared proposed Bloben (the link leads to a copy of the repo that I luckily had before he deleted his repository).

The Luna application began to take shape, but the developer is very young and very busy with his studies. Progress is therefore very, very, very slow.

Finally, there is Fluid-Calendar, which is very promising, but a couple of functions are still missing, which is why I’m sticking with Bloben for the moment.

I find it crazy that the community offers so many calendar solutions without providing a truly reliable and efficient frontend solution.