The Event Espresso SMS Reminder plugin will allow you to send SMS reminders to event attendees who register on your website powered by the Events Espresso plugin. The plugin integrates the SMS service from Twilio, which is reasonably priced with an excellent API, via our WP Twilio Core plugin on the WordPress.org repository.
Is it out yet? If so, where can I find it?
It’s actually available from a third-party developer here: https://themebound.com/shop/event-espresso-sms-reminder-plugin/