1) In 1961, the first Japanese language program in Hawaii started broadcasting on KIKU-TV. This program featured Japanese dramas and films, and was a popular source of entertainment for Hawaii's large Japanese American community.

2) On April 23, 1951, the first Hawaii Kai church was dedicated. This church, which grew to become a major religious institution in the area, was founded by Rev. Paul Tajiri and served as a hub for community gatherings and events.

3) In 1960, Hawaii hosted the Democratic National Convention, which was held at the Honolulu International Center. The convention featured speeches from prominent political figures, including John F. Kennedy, who was later elected president.

4) On April 23, 1927, the first interisland flight in Hawaii took place. A Sikorsky S-38 airplane piloted by Bertram J. "Jimmy" Hogg flew from Honolulu to Hilo, marking a major milestone in Hawaii's aviation history.

5) In 1972, the first Earth Day celebration in Hawaii was held on April 23. This event, which aimed to promote environmental awareness and conservation, featured a variety of educational exhibits and activities. Today, Earth Day continues to be celebrated around the world as a global movement for environmental protection.