While we don't yet offer a feature to send an email from the system, you do have the option to copy your attendees email addresses easily into your own email system. To do so, navigate to the attendee list for your event, then click the Options drop down, and click 'View email list'

You will then be able to easily copy your email list and BCC them into your own email tool, to email everyone at once:

Here's an example of how that can look, using gmail:

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