I’ve created a newer version of the WordPress Calendar plugin for the AlpineCalendar project. This one has moved to BootStrap 5 and now uses https://sa-si-dev.github.io/virtual-select/ to give category selections.
An example of the plugin in action is available below.
Mon
Tue
Wed
Thu
Fri
Sat
Sun
27
28
29
30
31
2
10
11
18
19
20
21