Get told when a deadline is extended, a new deadline is announced, or next year's edition is added. Pick whichever suits you.
Every deadline and conference appears in your calendar, with a reminder 7 days before each deadline. When the bot finds an extension, your calendar updates by itself.
If you use a feed reader such as Feedly, Inoreader or Thunderbird, add this address to it. Each change becomes a new item. Opening the address directly in a browser only shows raw data, which is normal.
If you have a GitHub account, open the repository and choose Watch → Custom → Issues to get emails about corrections and review requests.
Open repository