I’ve created a newer version of the WordPress Calendar plugin for the AlpineCalendar project.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
25
26
27
28
2
4
6
7
10
11
12
14
16
17
18
19
20
23
25
27
28
29
30
31