If you have IOS 9, you may not have noticed that when you get an email from someone for the first time, and the person is not in your contacts, the contact icon shows at the top of the email. If you tap it, you can add the new person to your contacts. The same works for calendar events. If there is a date in the email, you will get the option to add it to your calendar. Next time look for this at the top of your email if there is a date in the email.
Here are the contact and event icons at the top of an email
Below is the embedded date….