October 1st is a special day for couples around the world, according to and. It is celebrated as a relationship anniversary by some couples who got together on this day. The day has gained popularity on TikTok, where users are using the date as a signifier for the arrival of fall and particularly about falling in love in the fall. The trend involves setting videos to the song "we fell in love in october" by girl in red. While some people post lovely tributes to their girlfriends on Oct. 1, others make videos about how much theyd love to be on the date with their significant other.