It’s an event for infants!
So basically if you have a baby in your household, get them to play the xylophone and complete the hobby within the time limit to receive the rewards.
Since the xylophone can be purchased only ONE per game and it takes 3 hours 10 minutes each time, I’m not hopeful that I can complete it in time. Still, better than letting the infant sit around and do nothing, right?
Update:
Although I was not hopeful, I managed to complete it within the time limit.
Rinrin 