How to embed a calendar?

I need to create a calendar like this (

It does not look like Webflow has this option. Do I have to switch to another platform to have this functionality?

The site you linked to is built on Squarespace.
The Calendar in the site is from the YUI library.

I don’t know if Squarespace has this option or not, but in any case it is an external plug in, which you can easily implement in Webflow as well.