A lot of people search for meaning but...Labor Day?
Labor Day definitely has resonant historical significance as it honors the efforts of early union organizers, such as Eugene V. Debs and Peter McGuire, who established the standards that even non-union workers enjoy today (i.e. 8hr days, holiday pay, sick leave, etc.). Ironically, it is celebrated by not going to work.
If you are so inclined to create a tradition steeped in the "true meaning" of Labor Day then I suggest you gather up your co-workers every September and start making demands of your boss.