Fast route
Do this in order
- Step 1
Watch seasonal notices for the pumpkin-related event or quest.
- Step 2
Visit the marked autumn or festival area during its active window.
- Step 3
Speak to the peculiar pumpkin and finish the entire encounter; simply seeing the character is not enough.
Prepare before you start
Check the calendar, map portraits and relationship menu before starting. Time-limited and same-night goals are easiest with every item prepared in advance.