I dunno, it’d make some sense in light of other potential changes to have Ochi die on Jakku…
JEDIT: Aaaaand, there’s already a reason for Rey not to be familiar with the festival, since it takes place once in 42 years.
You’re absolutely right… in fact, I bet this was the plan for the first draft. Why else would they die on a desert planet shortly after giving away their daughter? Then they changed it to a new planet for some reason and forgot about it not making sense.