If you have a Squarespace website you can easily embed calendar/list widgets by following these steps:
2) Copy the code.
3) Open up your Squarespace website builder.
4) Click Pages> select the page you want to embed on
5) On the area you want to embed>Edit (top left corner)
6) On the area you want to embed>'+'
7) Embed> click the HTML symbol '</>'
8) Paste the generated widget code into the space> Back
9) Click 'Save' on the area you've just updated.