Google calendars can be embedded in posts or pages or even in your site sidebar widget area using the Stout Google Calendar plugin
For more information on what can be embedded in posts/pages and widgets, see:
WordPress Codex > Widgets > Using Text Widgets
WordPress Codex > Embeds > Can I Use Any URL With This?
Hi Alex, I’ve tried both options above and my embed code keeps getting deleted when I click save, both with the widget and on a page (and a post). I’m not toggling between the editors, either. Any advice? Thanks!