The 2020 event panel is gone for good.
IMatch 2021 makes events so much more useful by actually displayed them in their temporal relation to each other. IMatch 2020 could not do that.
You can see your events in a list when you use the "Find" function in the event bar. Very much the same you had in 2020.
When you disable the Files Calendar, your events are displayed side-by-side, in a very compact format.