With the release of mass messaging, you now have the ability to send messages directly from events.
To message all users who are enrolled in an event, simply click on the event, click the Manage Enrollment Tab, then click the Message Users button.
From there, you’ll be taken directly to the Create Message step of the Message Users flow. Once you’ve crafted your message, click continue.
From step 3, you can view or edit the users your sending the message to, to make sure that you’ve included all the proper people. Remember, the people who are enrolled in the event are auto-selected. You can also edit your message by clicking Edit Message. Once you’re set, click the Send Message button.