It’s the new month of Sivan!  As far as I know, this is the only Rosh Chodesh with its own niggun, written on this date 7 years ago.
It’s a very auspicious month.  On this date thousands of years ago (and/or in ahistorical time):

In the third month after the Israelites had gone forth from the land of Egypt, on that very day, they entered the wilderness of Sinai. Having journeyed from Rephidim, they entered the wilderness of Sinai and encamped in the wilderness. Israel encamped there in front of the mountain.

(Exodus 19:1-2)
And so it begins.