You can head over to the official Final Fantasy XIV event site for more details, but here’s a quick breakdown of what to expect for Starlight Celebration 2020.
Characters will need be level 15 in order to begin the seasonal event quest. If you meet this requirement then make your way over to Mih Khetto’s Amphitheatre in Old Gridania, one of FF14’s starting areas. You will need to talk to an NPC called Amy Garanjy and accept the quest “A Festive Fiasco”. Her exact location coordinates are X:10.2, Y9.4.
Rewards include the Snowman Bell which can be used to summon a snowman mount, as well as three wintery furniture constructs to build with (the Snow-dusted tree, Unmelting Ice Partition, and Unmelting Ice Loft).