Further information - this is what we're doing to generate things, which will hopefully make it clearer what I'm after:
zimbra@mailboxd:> zmprov
prov> sm <organizer email addy>
mbox> postRestURL /Calendar /tmp/meeting.ics
## meeting.ics contains the meetings, with everybody set to need to
## RSVP
mbox> syncFolder /Calendar
## At this point, the remaining problem is having the "save button" get
## clicked in each meeting in the web interface, which sends the
## notification out to all the folks to be scheduled.
##
## How we do that without logging in to the web client, I do not know.
I'm thinking a workaround would be to perhaps have all the accounts that we're generating meetings for temporarily share their calendars with admin so we can click through the lot, doing a lot of "save" - we can do that if we *have* to, but I like to think there's better things to be doing with my weekend after the migration...
Suggestions?