I tried to get an overview of calendaring but got an headache instead.

There are several authorative documents about getting iCal to work in RDF, but the schema is not consistent and some use other dialects, so pity me.

the mailing list
https://lists.w3.org/Archives/Public/www-rdf-calendar/

the wiki:
https://esw.w3.org/topic/RdfCalendar

the webpage
https://www.w3.org/2002/12/cal/

the good presentation
https://esw.w3.org/topic/RdfCalendarPresentation

this is the official test-case collection
https://www.w3.org/2002/12/cal/test/

the example by Masahide Kanzaki
https://kanzaki.com/works/2004/cal/concerts-tokyo.rdf

some of the cases use other ways to note dtend and dtstart, uff.

my Timezone...
https://www.w3.org/2002/12/cal/tzd/Europe/Vienna#tz