According to developer Firemonkey’s official patch notes for The Sims FreePlay’s Downtown High School Update (5.32), a new Internet Kitten Hobby Event is on the way.
The notes mention a “Viral Kitty Hobby Event” that will last 6 days. We don’t know when exactly the event will begin, but it does say that completing it will reward players with pairs of male/female cat or dog onesies.
The event will require the Internet Kitten hobby, which is unlocked once you complete the Puppy Odyssey quest and have purchased a cat and a Kitten Play Box from the Promotions’R’Us store. So if you want to get a head start on the event, make sure you have done all of that.
As is the case with most Hobby Events, you will be required to complete an entire hobby collection (not just a row) to unlock a reward. There are a total of 6 onesie packs for you to collect, which means you’ll have to complete the hobby 6 separate times.
On a related note, the Downtown High School Update also introduced the Teacher’s Pet Discovery Quest and Class Clown Hobby.