The phrase "to disrupt the event" means to disturb or interrupt a planned gathering or occasion, causing it to be disordered or unable to proceed as intended. Full definition
As fossil fuel executives took the stage to speak, hundreds of people rose up, disrupting the event by singing, and walked out. (350.org)
FILE PHOTO: Adam Neumann, CEO of WeWork, speaks to guests during the TechCrunch Disrupt event in Manhattan, in New York City, NY, U.S. May 15, 2017. (reuters.com)
More like pranksters than evildoers, these Web trolls intentionally disrupt events in online games or communities such as Second Life. (entrepreneur.com)