• January: Nightopians ring in the New Year by setting off fireworks once every hour beginning at midnight on January 1.
• February: Nightopians revisit the New Year theme to celebrate the Chinese New Year. This time you can catch them holding a giant dragon and throwing firecrackers.
• March: March is the month of carnivals, and as such many Nightopians will don a mask for the occasion.
• April: For this month the Nightopians show off their passion by wearing a Flamenco-inspired rose.
• May: The Japanese celebrate the Boys' Festival on May 5, and so do your Nightopians. This month they can be seen flying a carp streamer.
• June: Acknowledging the tradition of June weddings, Nightopians will appear with a bouquet or flower basket.
• July: Nightopians equip themselves with bull armor and a red cape to celebrate the Bull-Running Festival.
• August: Nightopians turn to music, performing with various instruments during this month.
• September: The Nightopians transition into fall with full moon paper fans.
• October: Nightopians will dress up as witches for Halloween and will also carry pumpkin lanterns throughout this month.
• November: Autumn leaves and fruit make for a perfectly nationality-free Thanksgiving for the Nightopians.
• December: Here's where the Nightopians really go nuts. Throughout December, the Nightopians will dress as Santa and join together under a Christmas tree. They can also be seen carrying around cake, wearing a tricorn, and letting off fireworks. On December 24 and 25 specifically the Nightopians will sing a special Christmas song.

Via 1Up