No flu shot is needed to attend the Ainsley House’s History Happy Hour event on April 21.

The evening discussion—for residents ages 21 and older—will center on the Great Flu Pandemic of 1918 and its effects on the Santa Clara Valley.

Historian Barney Terrell, a Campbell Historical Museum staff member, will discuss how the “three-day fever” made its way to the valley in November 1918.

According to the museum, 15 residents of the Santa Clara Valley died from the flu and 300 were infected. The flu caused the closures of many businesses, schools and institutions.

Portions of the San Jose Normal School—now San Jose State University—were used as hospital wards. Medical staff and volunteers from the Peninsula Hospital, County Hospital and private practices worked all hours of the day to help those infected.

According to the Santa Clara County Public Health Department’s pan-flu preparedness kit, from 1918 to 1919 the Spanish flu killed an estimated 550,000 people in the country and more than 50 million people worldwide.

History Happy Hour tickets for $15 are available for purchase online. The price include snacks, an alcoholic drink and self-guided tours through the Ainsley House, located at 300 Grant St.

Doors open at 5:30 p.m. and the lecture begins at 6 p.m. Money raised from the event benefits future programs at the Campbell Historical Museum and Ainsley House.

For more information, visit bit.ly/2ohyGRG.