iOS calendar templates

Does anyone know of a way to make templates that I can use in the iOS calendar? Basically I want to take a template and put it on a day ate in my calendar for a new event.

You could do this via Shortcuts

Fantastical can do this:

In the past I have also seen a (cheap) one-time purchase standalone App, just for templates, in the iOS App Store, but I forgot its name…

This is that standalone App: