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.

Friday’s secretive ceremony at the secluded and historic San Giorgio Maggiore island was the main event of the weekend — and Sanchez’s gown, revealed just after, was a year and a half in the making.