Many of our users use the Oxygen builder and its accompanying theme with our plugins. Sometimes they don’t work together seamlessly, but with a few tweaks, your single event page and your main calendar page will play together nicely with Oxygen.
If you are using our legacy calendar views, make sure to enable the updated calendar views under Events → Settings → Display.
Next, make sure that you choose the Default Events Template option.
From there, you can create a new template with Oxygen and add the code provided in this handy tutorial on the Oxygen website.