Just a Normal day- why is there 1.3.29??? (Turn your sounds louder to hear me)

I'm just wondering why there is 1.3.29. And since 2 days! Nothing in the announcements on Discord:
Just a Normal day- why is there 1.3.29??? (Turn your sounds louder to hear me)
Just a Normal day- why is there 1.3.29??? (Turn your sounds louder to hear me)
Just a Normal day- why is there 1.3.29??? (Turn your sounds louder to hear me)

louder