1. International Workers' Day: May 1, also known as International Workers' Day, has been celebrated in Louisiana since the late 19th century. Workers in the state, particularly those in the labor movement, commemorate the day as a means of promoting the rights and interests of the working class.

2. Fête de Marins: May 1 is also celebrated as the Fête de Marins, or Seamen's Day, in Louisiana's coastal communities. The festival commemorates the state's maritime heritage and honors the region's seafarers and fishermen.

3. The Battle of New Orleans: Although not directly related to May 1, the Battle of New Orleans was fought just a few months earlier on January 8, 1815 - and is considered one of the most significant events in Louisiana history. The battle saw American forces, led by future President Andrew Jackson, defeat British troops in a decisive victory that ensured the state's place in the newly-formed United States.

4. Huey Long's Assassination: On September 8, 1935, Louisiana Governor and Senator Huey Long was assassinated in the Louisiana State Capitol - a building he had constructed and that remains one of the state's most iconic landmarks. Long, who had gained national notoriety for his populist policies and larger-than-life personality, was shot by a political opponent and died two days later.

5. Jazz Fest: While not historically significant in the same way as the other events on this list, the New Orleans Jazz & Heritage Festival - typically held in late April and early May - is a cultural institution in Louisiana. The festival, which was first held in 1970, showcases the region's musical heritage with performances by some of the biggest names in jazz, blues, and other genres.