See also:
RFC 2446: iCalendar Transport-Independent Interoperability Protocol (iTIP)
tools.ietf.org
Specifies how calendaring systems can use iCalendar objects to interoperate with other calendar systems.- RFC 2447: iCalendar Message-Based Interoperability Protocol (iMIP)
tools.ietf.org
Specifies a binding from the iCalendar Transport-independent Interoperability Protocol (iTIP) to internet email-based transports. - RFC 2445: Internet Calendaring and Scheduling Core Object Specification (iCalendar)
tools.ietf.org
Official specification for the format, including full syntax and recommendations. 
iCalendar Validation
icalvalid.cloudapp.net
Online tool to check files, URLs, and pasted snippets for compliance with the RFC 2445 and RFC 5545 standards.- Wikipedia: iCalendar - Encyclopdia article on the format, with an overview of the specifications, and details of various implementations.
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