1. Summer Solstice: June 21 marks the summer solstice, the longest day of the year in terms of daylight hours. In Michigan, this means up to 16 hours of daylight, depending on the location within the state.

2. Sault Ste. Marie Canal Opens: On June 21, 1895, the Sault Ste. Marie Canal was officially opened in Michigan's Upper Peninsula. This engineering feat allowed for large ships to bypass rapids in the St. Mary's River and sail directly into Lake Superior.

3. Detroit Tigers Win World Series: On June 21, 1945, the Detroit Tigers won the World Series, beating the Chicago Cubs in seven games. This was the Tigers' second championship in five years and their fourth overall.

4. Mackinac Bridge Groundbreaking: Ground was broken for the Mackinac Bridge on June 21, 1954. The bridge, which spans the Straits of Mackinac and connects Michigan's Upper and Lower Peninsula, was completed in 1957 and is still one of the state's most iconic landmarks.

5. First Legal Same-Sex Marriage: On June 21, 2014, Michigan's ban on same-sex marriage was overturned by a federal court ruling. Later that day, the first legally recognized same-sex marriage in Michigan was performed in the city of Southfield. This decision was a major milestone in the fight for marriage equality nationwide.