How do I add an 'add to calendar' button?

Site URL: https://bonnieandgarcia.squarespace.com/

Hi 

I would like to add a 'save the date' button to my home page. I note that I don't want to create a separate events page just yet, just a single button on my home page that will add the date listed (6 February 2021, 5pm to 10pm) to the recipient's apple or google calendars. Is this possible? 

My URL is https://bonnieandgarcia.squarespace.com/

password: pablo304

Thanks in advance!