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
Potential solution here that fixed a bunch for me!
https://forums.ea.com/idea/the-sims-4-bug-reports-en/reapers-rewards-plumbob-icons-for-quests-no-longer-available/4971089/comments/4976867