To unsubscribe from Live streaming you would go to your Events page, click Billing in the drop-down menu:
Go to "My Subscriptions", click the "Change plan" button in the Streaming section.
On the Subscription Purchase page click "Unsubscribe" to cancel the subscription.
To confirm, click "Unsubscribe" in the pop-up window.
You will be redirected to the page "My Subscriptions", which will contain information about the cancellation of a subscription.
Also, you can keep the subscription by clicking on the button "Keep this subscription", or upgrade the Live Streaming subscription.