1. In 1889, the first-ever Labor Day celebration in the state of Washington was held in Seattle on May 1. This event was organized to honor and recognize the contributions of workers and labor unions to the development of the region.

2. On May 1, 1890, the Tacoma Street Railway Company implemented a new fare system that led to widespread riots and violence throughout the city. The unrest lasted for several days and resulted in multiple injuries and arrests.

3. May 1, 1907, marked the opening of the Pike Place Market in Seattle. The market quickly became a popular destination for both locals and visitors, and it has since become one of the most iconic tourist attractions in the state.

4. In 1971, the Seattle government declared May 1 to be "May Day," a day to celebrate the arrival of spring and the renewal of life. This tradition continues to be observed in Seattle and other parts of the state.

5. On May 1, 2000, a large protest took place in Seattle in response to the World Trade Organization meeting being held in the city. The protest, which included thousands of demonstrators, was largely peaceful, but there were some instances of vandalism and clashes with police. The event has since become known as the "Battle in Seattle."