1. Sign in Google.com (@gmail.com).
2. Click "Google apps", then select a Calendar icon.

3. Click "Settings menu", then select a "Settings".

4. On the left side of the screen.
- Click your calendar name, then click “Integrate Calendar”.
- You’ll see a block of code in the Embed Code area. You can simply select and copy this code.



 

5. Go to RVsitebuilder Editor Content Menu >> Select Page and click section content to edit html code.

6. Paste the embed code. If you want to make changes to the size (width or height) to change the code, then click "OK".

7. Save and review your website.

Reference: https://support.google.com/calendar/answer/41207?hl=en