1. On the event Dashboard, click on "Promotions" on the sidebar
2. Click on "Mailers" under the Promotions side bar.
3. At the top under Mailers, select "To Contacts" to send Invitation mailers
4. Click on "Manage" under the Mailer
5. Click on "Activate Mailer" to start sending Invitation Mailers.
6. Confirm to activate the mailer, once activated it cannot be stopped.
