You can set up your badge types to automatically subscribe your attendees to your MailChimp mailing lists. Each badge type has it's own setting, so that way you can easily put exhibitors on one list, attendees on another, and GM's on a third list if you want to based upon what badge type is selected.
This video shows you how to find all these settings in Mail Chimp:
A Few Notes
If you don't set up your configuration right, we'll send you an email letting you know so you can fix it.
We won't subscribe users that are already subscribed.
We will skip subscribing people who do not specify an email address with their badge.
If a user has previously subscribed and is now set to "unsubscribed" on your MailChimp list, they will not be re-susbcribed by this process.