1. Indianapolis 500: The Indianapolis 500 Race, one of the most famous motor racing events in the world, has been held on May 30, at the Indianapolis Motor Speedway in Indiana since 1911.

2. Memorial Day: May 30 was designated as "Decoration Day," now known as Memorial Day, in the United States. It was a day to decorate the graves of fallen soldiers who died during the Civil War.

3. Born in Indiana: Mel Blanc, the legendary voice actor best known for his work in Warner Bros' Looney Tunes and Merrie Melodies, was born in San Francisco but grew up in Portland, Indiana, on May 30, 1908.

4. Tornado Outbreak: On May 30, 2004, a tornado outbreak occurred in Northern Indiana, causing several fatalities and massive damages in the towns of Walkerton and Wheatfield.

5. Washington Hall: May 30, 1879, marked the dedication of the Washington Hall building at the University of Notre Dame, which still stands tall today as a testament to the university's longstanding traditions of academic excellence and community values.