Not sure if this is a bug, intended changes or even just my own perceptions/campaign experiences, but it seems like some of the older dilemma events aren't resolving properly. I know it sometimes takes multiple turns to see the resolution but it seems like in some of my campaigns that events pop up and then never show the resolution. I don't have any save games to share unfortunately.
In addition it seems like some festivals don't trigger that used to show up. This isn't something new in the ancestral update but since power and politics came out I played a Lepidus Imperator Augustus campaign and I don't recall seeing any of the roman festivals that used to show up occurring at any time during the campaign.
I know this is a rather vague problem description, but if there is time it might be good to take a look generally at dilemma/festival/event triggering and outcomes. If anyone has any better specific examples to add please go ahead.