Hi and welcome 🙂
I checked on my test site which has the default WP theme and only our plugins active. As you can see, the map is showing on the single event pages:

I also happen to have the latest version of Avada (5.1.1) and am still not experiencing the same behavior:

Can you review our Setting Up Your Google Maps API Key tutorial and make sure you have your API properly set up? I took a look at a single event on your page and noticed a related error in the browser console:

Let me know if this helps and have a great evening. Cheers!