If you wish to change any of the wording on the event page, you can try using a 3rd party plugin called "Say What?":
Say What? - A 3rd party plugin that allows you to alter strings on your site without editing WordPress core, or plugin code. Simply enter the current string, and what you want to replace it with and the plugin will automatically do the rest.
Here's the link: https://en-ca.wordpress.org/plugins/say-what/