Excerpt: 401(k) Day is an annual celebration spotlighting the importance of employer-sponsored profit sharing and 401(k) plans. As retirement follows work, 401(k) Day officially falls on the day after Labor Day. You may choose another date that is more convenient for your work force.... 401(k) Day is an excellent opportunity for your company to demonstrate to employees that you care about their retirement with a subtle reminder of the many benefits of your 401(k) plan.