Anytime you add an event to your calendar you can send out a tweet to those following you. My first use for this is for posting homework assignments. When I add a homework assignment it gets tweeted (or texted) to my students who are following me. If people don't want a Twitter account they can still get a text by texting 40404 "Follow @yourTwitterlist"
If
New event added
This Trigger fires every time a new event is added to your Google Calendar. Note: The time in the ingredient will be based on the timezone set in Google Calendar.
Then
Post a tweet
This Action will post a new tweet to your Twitter account. NOTE: Please adhere to Twitter’s Rules and Terms of Service.
Discover more time saving integrations for Twitter and Google Calendar