Whenever you add a new iOS contact mark it in your Google Calendar

Google Calendar is a free time-management web application offered by Google. Turn on Applets to add the most important information, right into your calendar, automatically — and get custom notifications about the events that matter the most to you.
Back up your contacts, attach them to reminders or calendar events, and much more with this service. To use these Applets, you'll need to install the IFTTT app for iOS.