Widgets are located under
Appearance > Widgets or in the
Appearance > Customize > Widgets section.
Widgets do not provide different functionality than shortcode functions, but they do make it easier to implement secondary calendars.
Block widgets are used in the Core Editor (Gutenberg).
Appearance > Widgets.
Add widget blocks by clicking the top left blue square with a + in it to open the block inserter. (The blue square changes to black when open.)
The block inserter area looks like this.
Widgets are pictured using the block widget interface, but are also available in the classic widget interface.
My Calendar: Today’s Events
My Calendar: Upcoming Events
My Calendar: Mini Calendar
My Calendar: Simple Event Search
My Calendar: Event Filters
Appearance > Customize
Have the same block widgets as are seen in the Widgets screen.
Here is an example using the My Calendar: Mini Calendar.