How to embed gcal in squarespace without a premium plan
From Home, navigate to Pages
Create a new blank page called “Calendar” (I created mine under Not Listed so it only can be found by going tabb.me/calendar)
Click Edit Page Content, then the + and add the “embed” content block to the page.
Click the </> icon beside “Enter an embeddable URL here”
In the text box, paste the below code block, but replace name and mail.com with your email address, leaving the %40 in place of @. You can also customize some of the attributes like height and bgcolor.
<iframe src="https://calendar.google.com/calendar/embed?showTitle=0&showPrint=0&mode=WEEK&height=500&wkst=1&bgcolor=%23FFFFFF&src=name%40mail.com&color=%231B887A&ctz=America%2FNew_York" style="border-width:0" width="100%" height="500px" frameborder="0" scrolling="no"></iframe>
Hit set then apply then save
Hover over the page name “Calendar” on the left side panel and click the gear icon for settings, then adjust the URL slug to “cal” or “calendar”
Celebrate, because you have a new calendar pagee 🎉