May 4 is not just a date to celebrate Star Wars day (an informal commemorative day observed annually on May 4 to celebrate the Star Wars media franchise), but another important day for Rotary.
On May 4, 1987, the U.S. Supreme Court ruled that Rotary clubs could no longer exclude women from membership on the basis of gender. It all started with Sylvia Whitlock from the Rotary club of Duarte, In a lawsuit filed by the Duarte club. In 1983, the California Superior Court ruled in favor of Rotary International, upholding gender-based qualification for membership in California Rotary clubs. In 1986, the California Court of Appeals reversed the lower court's decision, preventing the enforcement of the provision in California. The California Supreme Court refused to hear the case, and it was appealed to the U.S. Supreme Court.
As they say, the rest is history. To learn more, including a timeline of women in Rotary, visit the History of Women in Rotary.