Automatic event recognition in Gmail
Google makes it easy for you to keep track of your schedule. Just like we do with addresses and package tracking numbers, Gmail displays an "Add to calendar" link when you open a message that contains event information. This way, you can easily add the event to your Google Calendar.
Just click on the link and fill in the appropriate information, then click the Save Changes button. (You may be asked to sign in to your Google Calendar account, if you're not signed in already.)