From Destinypedia, the Destiny wiki
The Revelry was a limited time spring event within Destiny 2 and took place during April 16, 2019 to May 6, 2019.
The Revelry is a new event available to all Destiny 2 players that celebrates the joy of Spring. The Tower is overflowing with colorful arrangements, and Eva Levante has a new activity for you to enjoy with new rewards to claim. But that's just the beginning—the celebration spans across the solar system, offering ways for your character to feel more powerful in every activity Destiny 2 has to offer.
Tower, Bazaar District