1. Vermont Statehood Day: May 1 is celebrated as Vermont Statehood Day to commemorate the day Vermont was admitted to the Union as the 14th state in 1791. In fact, May 1 was declared a legal holiday in Vermont in 1915.

2. Labor Day: May 1 is also recognized as the International Workers' Day, which commemorates the 1886 Haymarket Riot in Chicago, which led to the eight-hour working day. Labor unions and workers across Vermont and the world celebrate this day by holding rallies to demand fair wages, better working conditions, and workers' rights.

3. Green Up Day: May 1 is also celebrated as Green Up Day in Vermont, a community-wide event where volunteers come together to clean up litter across the state. The tradition started in 1970 when Governor Deane C. Davis signed a bill designating the first Saturday in May as Green Up Day.

4. May Day Celebrations: May 1 was traditionally celebrated as May Day in Vermont and other parts of the world by holding festivals, dances, and feasts. In Vermont, May Day celebrations included crowning the May Queen, dancing around the Maypole, and other festive activities.

5. Ethan Allen’s Capture: May 10, 1775, marks the day when Ethan Allen, the leader of the Green Mountain Boys, and Benedict Arnold captured Fort Ticonderoga from the British during the American Revolution. Although not on May 1, this event is crucial to Vermont's history and is often commemorated throughout the state.