The Public Beta of Conference Events has been announced by Twilio, allowing developers to subscribe to changes in participant and conference states and receive notifications accordingly. This feature reduces the complexity of applications by eliminating the need to constantly poll the API for state updates. Webhooks for Key Events are also available, enabling developers to trigger webhooks on specific state changes of Conference or Participant resources. The new StatusCallbackEvent parameter can be used to enable Call Progress Events, which notify developers when a conference starts, ends, participants join or leave, and other events occur. This feature enables developers to control call legs and take actions in response to participant status changes, making it easier to build Collaboration and Call Center applications faster and more efficiently.