You can create own email template for the user activity like Changes the default user registration email templates. When new user register then send mail with own defined template.
During the plugin activation process, plugin will not create any table or any meta entry in the database.Once activated you’ll be able to use the form shortcode.
For overriding or customization template files can be found in the wp-event-manager-emails/templates/ directory. To override a template file, first you need to create directory “wp-event-manager-emails” under your theme folder and copy the template file to “/wp-content/yourtheme/wp-event-manager-emails/” directory. Your theme will use all the template files from the “/wp-content/yourtheme/wp-event-manager-emails/” directory instead of the plugin’s template file (/wp-content/plugins/wp-event-manager-emails/).
Remember: if you have overrided template file and plugin frequently updating then you need to sync template file with new updates from the plugin’s template file for better functionality and new features.