I searched the TES site today and found no assembly for the New Year so here goes!It is aimed at Secondary school children but could easily be adapted!
For the Intro here is some background on where the name of the month January comes from:
In ancient Roman religion and myth, Janus (/ˈdʒeɪnəs/; Latin: Ianus, pronounced [ˈjaː.nus]) is the god of beginnings, gates, transitions, time, doorways, passages, and endings. He is usually depicted as having two faces, since he looks to the future and to the past. It is conventionally thought that the month of January is named for Janus (Ianuarius),[ but according to ancient Roman farmers' almanacs Juno was the tutelary deity of the month
Janus presided over the beginning and ending of conflict, and hence war and peace. The doors of his temple were open in time of war, and closed to mark the peace. As a god of transitions, he had functions pertaining to birth and to journeys and exchange, and in his association with Portunus, a similar harbor and gateway god, he was concerned with travelling, trading and shipping
You could use ABBA- Happy New Year but that would depend on whether you've already see Mamma Mia 20 times!
Any way whatever you do, I hope 2017 is a good year for you!