Squarespace

In your Eventable dashboard, go to the Events tab 

Click the Share Event button for your specific event, choose the Website tab 

 Choose your button style 

 Copy the embed code using the green button in the bottom right corner

On your Squarespace website, hover over the page where you'd like to embed your button, and select Edit

Select </> Code from the dropdown menu

Paste in the code you copied from the Eventable dashboard

Click Apply to save your changes