104th commemoration of Chicago’s greatest loss-of-life tragedy, the Eastland Disaster, hosted by The Eastland Disaster Historical Society. The ceremony is an opportunity to connect with other individuals and families whose legacies all intersected on July 24, 1915. All are welcome to participate and be part of the growing public audience that remembers the tens of thousands of people who were involved in the Eastland Disaster while commemorating the history of the tragedy. 12:00 p.m., Chicago Riverwalk between LaSalle and Clark Streets. Map. More info.

New York Times bestselling author Jasmine Guillory presents The Wedding Party, her exhilarating new romance that has been selected as a Reese Witherspoon x Hello Sunshine Book Club Pick. Maddie and Theo have two things in common: Alexa is their best friend and they hate each other. After a night together, neither can stop thinking about the other. With Alexas wedding rapidly approaching, Maddie and Theo both share bridal part responsibilities that require more interaction with each other than theyre comfortable with. 6:30-8:00 p.m., American Writers Museum, 180 North Michigan Avenue, Second Floor. Cost: $12.00. Books will be sold and signed at the event. Map. More info.

Cristian Macelaru, a rising star in the conducting world, makes his Grant Park Music Festival debut, leading the orchestra in a suite from one of the most popular and famous ballets of all time, Tchaikovsky’s Swan Lake. The evening opens with Gulda’s Cello Concerto, a pioneering mix of jazz, rock, and classical music, featuring 24 year-old French cellist Edgar Moreau. 6:30-8:00 p.m., Jay Pritzker Pavilion, 201 East Randolph Street. Map. More info.