https://www.gamespot.com/articles/last-chance-to-play-final-fantasy-15s-assassins-cr/1100-6456407/

Final Fantasy XV has certainly received its share of bizarre DLC, from Power Rangers-like combat suits to a Cup Noodle hat, but one of the most unexpected additions to the game is the Assassin's Festival, a limited-time event themed after Ubisoft's Assassin's Creed series. The event has been running on PS4 and Xbox One since last August, but those who've yet to participate in it only have a few more days to do so.

The Assassin's Festival is scheduled to conclude on January 31, making this your last opportunity to take part in the event and earn Assassin's Creed-themed items. Like the Moogle Chocobo Carnvial, the Assassin's Festival is free for all players to participate in and is a self-contained mode that's accessed from the main menu. Along with quests and mini-games, the Assassin's Festival adds gameplay elements from the Assassin's Creed series to Final Fantasy XV, such as stealth segments and the ability to perform a Leap of Faith.