Ask if it is for the Russian new year because many Russian Jews have New Year's trees
The Russian New Year is actually January 14. It's January 1 on the Julian Calendar. In 2100, it will start being on January 15. But Communist Russia destroyed religion so they celebrate a Secular New Year mixed with X-mas. The Russian X-mas is actually January 7.
Either way, it's goy nonsense. Even self-hating Israelis have an evil day which they refer to as "the Silvester". They celebrate the Secular New Year under an Xtian name that even goyim in the West don't and just view it as a Secular holiday.
I heard they call it 'the Silvester" because Haredim looked on the calendar and saw a goy holiday on December 31 to persuade Jews not to celebrate it. But it backfired and they actually started celebrating it as "the Silvester" rather Rosh HaShana HaEzrachit (The Civil New Year), which is the correct name for New Year's Day in Hebrew.