National Reuben Day is celebrated annually on November 17th to honor individuals named Reuben and recognize their contributions across various fields, including chess, mathematics, and business. The day is rooted in the biblical figure Reuben, the firstborn of Jacob and Leah, highlighting the name's historical and cultural significance. Celebrations often include activities such as costume parties themed around famous Reubens or variations of the Reuben sandwich, deli crawls to find the best Reuben sandwiches, and creative mixology challenges to craft Reuben-inspired cocktails. The day encourages connection among those named Reuben, fostering a sense of community and shared heritage while also educating others about the name's legacy.