I don't think Festival of light affects anything other than giving you dates with Caleah (iirc you need two dates to max out her affection), it was just something I was spitballing as a possible reason the Ghost hadn't spawned for you, likewise your Goblin Daughter and the Knights in the Tavern are connected... Both are quests I'd always had done this long before "Go Forth and Multiply" even appeared for me, so they stood out as the only things that might be the culprits as far as I could see.Haven't been save editing. Don't really know how to do that. But I did go back and find the lights (didn't know to pick them up). BTW, the walkthrough on this site doesn't have Festival of Lights, so I missed getting the lights when I got the idol. Also, Festival of lights doesn't show up on the quest dependency chart, either. So now that we've had the date, I will go back to the temple and see what happens. Do I need to talk to Ziva or is there any quest that immediately follows Festival of Lights that I'm missing? Don't know about Oksana. She just showed up in the tavern one day and I went from there.
My top suspicion is you already had both ghostly visits but maybe one glitched or accidentally skipped... I'm fairly certain it's a requirement to even start "Go Forth and Multiply" which is clearly started. But I'm just another player just like you... Maybe I got it wrong or Tinkerer changed something.
if you want to try talking to Ziva, just remember you can't talk to her just after the morning service, after a pregnancy notification or after a birth notification (basically anytime she isn't alone infront of the alter), you need to exit the room and re-enter to get her ready for a conversation.