How do I add an event with named and defined time zone?

Prior to my work with the API, I was adding events to the Google
Calendar by creating iCalendar (".ics") files and manually importing
them on the web. This all worked fine. The Calendar files typically
have several events, around the world, with several time zones. Each
event date/time typically has a time zone defined by name, eg:

DTSTART;TZID=/softwarestudio.org/Olson_20011030_5/America/San_Francisco:2
 0061014T090000
DTEND;TZID=/softwarestudio.org/Olson_20011030_5/America/San_Francisco:200
 61020T180000

Then at the end of the file is a definition for every time zone used
earlier within the file; eg:

BEGIN:VTIMEZONE
TZID:/softwarestudio.org/Olson_20011030_5/America/San_Francisco
X-LIC-LOCATION:America/Los_Angeles
BEGIN:STANDARD
TZOFFSETFROM:-0700
TZOFFSETTO:-0800
TZNAME:PST
DTSTART:19701025T020000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:-0800
TZOFFSETTO:-0700
TZNAME:PDT
DTSTART:19700405T020000
RRULE:FREQ=YEARLY;BYMONTH=4;BYDAY=1SU
END:DAYLIGHT
END:VTIMEZONE

There would typically be several such definitions.

Q: How do I add such time zoned events using the C# API, either with my
own named time zone definition (as above), or using
pre-defined-by-Google time zone definition please?

Example file with one time zone:
http://lef.csc.com/events/listings/study_tours/15_10_06/CSCLEF20061015ST.ics

Example file with multiple time zones:
http://lef.csc.com/events/listings/CSCLEFEvents.ics

John Walton