odds of random events : constant or dependent on amount ? (temple kill event etc. )

[Boron]

how are the odds for random events distributed ?
lets say you take luck 0 .
some events have conditions/requirements to fire like the temple kill events .

so does dominions simply check if the requirements are fulfilled and move all events where they are into 2 pools one for bad and one for good events ?
then when a random event has to be chosen first at luck 0 with 50% probability either a good or bad event is chosen .
then dominions just choses one random event out of the good / bad random event pools .

do there all events have the same chance of being chosen of 1/number possible events in pool ?
or do the chances for a temple kill event increase the more temples you have ?

furthermore are there additional event triggers like you may get no +1000 gold event in the first 10 game turns ?

furthermore , inspired by an old statement of norfleet :
no more random events than 3 / turn can happen .
doom horrors create bad events though .
norfleet said he once got 8 bad random events from doom horrors in one single province .

are there special rules for doom horror events or are they the same as for every event from the bad events pool ?