You can be notified whenever the system may be unavailable - for example for scheduled maintenance windows.
Just click on the Intercom IM button in the bottom right hand corner of any console screen:
You'll then see a clickable link box:
Click on this and it takes you to the system status page (at http://status.crowdconnected.net/), illustrated below, which provides the option to subscribe. Enter your email address. You will the receive an email to your inbox asking you to confirm your subscription.