From the Introduction: "Labor Day is a federal holiday celebrating the achievements of American workers. Labor Day also symbolically marks the end of summer and the beginning of the school year. This guide is designed to assist congressional offices with work-related Labor Day celebrations. It contains a brief history and selected resources for additional historical and legislative information, CRS [Congressional Research Service] reports, sample speeches and recognitions from the legislative branch, presidential proclamations, statistical information on the U.S. labor force, and cultural resources on celebrating the holiday."
CRS Report for Congress, R44152
Congressional Research Service: https://crsreports.congress.gov/