The calendar itself will have templates for the days in our upcoming 2.24.0 release so you will be able to add markers and icons to them, you can preview how that will work here.
Regards,
Marin Bratanov
Progress Telerik
Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Check it out at https://learn.telerik.com/.