MailChimp

One of the challenging things about running an Agora is reaching all of the people who might be interested in attending. You have social media as one option, but that is noisy and there's no guarantee your desired audience (say, people who previously attended an event) will ever see it.

This is where MailChimp comes in, as it allows you to create and manage large email lists of up to thousands of people without the hassle of keeping track of them in G Suite or only using Eventbrite (both of which are alternatives). You can still send out mass emails using Gmail, and you can let previous attendees know about your upcoming event by using Eventbrite, but if you want to start your own newsletter connecting people with each other or other events, then MailChimp is best.