As an event Admin, you can cancel any participant’s meeting request.

Step 1. In this example, Attendees are sending meeting requests. So we’ll head to the Attendee List:

Step 2. Filter the list to locate the Attendee whose request you need to cancel.

Use the Action menu to choose Meeting Requests Sent:

Step 3. Locate the request you need to cancel. Head to the right side of the page and click on the menu. Then choose Cancel:

Step 4. In the pop-up, you can offer a reason, and choose whether to send an email note to the request recipient. Click Submit to process the cancellation: