I'll start with I play on PC and I don't use any mods. I started a new character for the event, a single female living in Willow Creek. I was able to do the event through the planting of the flowers ...
Ideas
I have the same problem (even after that 1 Oct hot fix). Ambrosia Society Newsletter just disappeared after I have completed some of the week 1 quests. To make the problem even worse, I cannot find any reaper event quests from my UI (can only view the UI showing rewards BUT NOT the quest UI). That's really frustrating as I cannot do anything with the event!!
I have never used any mods or anything that are not officially released. This is really such a disappointing experience. I hope EA will fix the problem ASAP!