Great if we can sync the members list to the mailchimp, thank you for being on that!
BUT I would not recommend sending zoom-invites through the mailchimp to all members mails. If we do this, a lot of members will unregister because they feel spammed (I would personally be pretty annoyed). I do not think that the mail list should be used to promote events. Events can be promoted through facebook etc.
The mailchimp newsletter function (and the list of mails we have to all members) should, according to me, ONLY be used for exceptional cases of important information, and not for specific events.