One-One-One Day, also stylized as 1-1-1 Day, is a special holiday on Earth-19 for people who have reportedly found their other half.
Gypsy came to Earth-1 to go out with Cisco for One-One-One Day, but initially he couldn't make it and she got upset with him. However, they eventually celebrated the holiday, with Gypsy wearing a dress.
The Chronicles of Cisco
- 1-1-1 Day seems to be Earth-19's version of Valentine's Day.