Happy Merry Chistmas to all of you in the first place

I want to make a work calendar through which I will determine the days of official occasions and official festivals that I will be used after when displaying the attendance data so that all days remarked as weekends, official occasions and official festivals will not appear when viewing the attendance data and when setting the absences. I do not know how to make such calendar especially the design I do not know what controls I should use and how the calendar will looks like. I do not want codes but all I need is design ideas and capabilities that can be involved in such calendar.