This page offers a guide on how to complete the main quest, Farewell Party in My Time at Sandrock.
This quest follows the main quest, The Show Must Go On.
Attend the Party on Time
After telling Matilda that you and Mi-an have completed the new stage, you’ll be instructed to attend the Farewell Party for Mason, the retiring builder.
The party is the following morning so you’ll have to spend the rest of the day doing other things before you can attend the party. You won’t need to even head over to the stage site - as soon as you’re awake you’ll be teleported over to the stage!
After attending the party, you’ll be rewarded +1 Events Photo, +5 Matilda Relationship and +100 Experience.