event details page for some reason requires triggerid in addition to eventid.
even though the triggerid passed to the event.get method, it is not required - api call with eventid works just fine. event table also holds the triggerids, so it should be no performance issue either.

one usecase is something that pops up on irc every now and then - somebody got an eventid and they would like to know more about the event. unfortunately, currently it's not as easy as plugging the eventid in the event details page.
the error message is : 'Field "triggerid" is mandatory.'