Most parts of an events management & display can already be built with a custom post, acf, and the query block (the list or grid of the events and the single event page) and we have complete customization possibilities.
The missing part is a calendar that could display these events from dynamic data.
Given that currently none of the event plugins are working with full site editing (or generally their block support is bad) this could be a useful feature to have.
We already have most of the building blocks for a calendar they just need to be put together