The good news? I remembered. :) (Though I probably could have brought this out more in the original article). Thanks muchly for bringing it up.
As the priests of Zilchus would certainly want to keep close to the centre of power, sending invitations to the Oligarchs - without the need for a suitable donation - makes perfect sense.
Probably the heads of other major organisations might be invited as well... it's unknown whether the Patriarch of Pelor would attend, though.