Limit other people from starting and ending the event with speaker permissions.

[Read how](https://help.getcontrast.io/en/articles/7941534-speaker-permissions?utm_medium=noticeable&utm_campaign=getcontrast.speaker-permissions&utm_content=publication+link&utm_id=iXVDnCslirUmpJaJC2xS.UZ6A85bnnacc2B8shFoM.n9dVKbB8YBYzLHp3q478&utm_source=newspage)