For parity with Blog:

1) List Image

2) List Image Alt

3) Detail Image

4) Detail Image Alt

For common Events use-cases:

1) Dropdown for a) Event is in-person b) Event is online c) Event is hybrid (alternatively checkboxes for the 2 options allowing both to be selected)

2) Online meeting link

3) Meeting Recording Link

Some will have already used custom fields or re-purposed the address field for the latter 3, but I think adding these fields is sensible and will allow module builders to extend the Events module in interesting ways.

It would be up to the developer building the layout whether to expose the meeting link on the Events Page or only on the ticket purchased. This would just be a standard place to place the data.