To get the embedded code for your Constant Contact email:
In your Eventable dashboard, go to the Events tab
Click the Share Event button for your specific event
If you haven't already, select HTML as your email type
Select Constant Contact from the dropdown menu
Right click on the calendar buttons and Copy Link Address. Repeat this process for every single calendar button. Do not copy the embed code
To paste the Link Addresses in Constant Contact:
In Constant Contact, select Button from the left hand panel
Drag the Button into the right hand panel
Click button Link, paste the copied Link Address under Link URL. Repeat this process for every single calendar button.
Edit button text and color to fit the respective calendar providers
Preview your buttons in the email by clicking Preview