Steps to follow:
Step 1: Choose the event from which you want to delete the speaker.
Step 2: Find the Speakers & Hosts tab on the left-hand side of the dashboard.
Step 3: Choose the Speaker you want to delete and click on the three-dot button and then select the "Delete" bin icon to delete a speaker.
You can also click on the "Preview" after selecting the speaker and then click on the "Delete" button to delete that particular speaker.