Here's how to set up Mailchimp through your Helm Tickets account.
Head to your Dashboard sidebar, and under "Utilities" select MailChimp.
From there, you'll be asked to log-in to your MailChimp account (it's free to register!).
Once you're logged in, you'll see your event listings and MailChimp campaigns - Check which ones you'd like synchronised! This will send all email addresses associated with your event to your MailChimp campaign ready to be contacted.