Use the QWeb templating mechanism for emails
Know and track (un)subscription reasons, GDPR compliant
Mail settings in events
Mass mailing lists that get autopopulated
Share your events via social media
Manage your mailchimp audiences with Odoo
Avoids duplicate mailing lists and contacts
Add contacts to event and event type
Allow registration grouped by quantities
Allows sell registrations with more than one attendee
Set question templates for events