As the PP said, this year, the end of the holiday season is slightly staggered. The holiday offerings in DL (Christmas Parade, Believe in Holiday Magic Fireworks, HMH, etc.) official end on Sunday, January 6 (last day). However, IaSWH will remain open through Jan 20. The holiday offerings in DCA (Festival of the Holidays, Viva Navidad, Three Kings, etc.) will remain through Tuesday, January 8 (last day). It'll take a while to remove all of the decorations, so you'll probably see some remnants for several days.