Usher and DJ Cassidy will be performing at Jeff Bezos and Lauren Sánchez's final wedding bash on Saturday night, June 28. 'It's the culmination, the final big party,' a source tells PEOPLE of the event.

The wedding, hosted in Venice, Italy, reportedly cost millions of dollars as residents protest the upcoming luxury event.

Just one day after longtime Vogue chief Anna Wintour announced she would step away from her role as editor in chief of the U.S. edition, the magazine published a digital cover story featuring Lauren Sánchez (now Lauren Sánchez Bezos) in her wedding dress,