Franky

A simple plugin to sync Facebook events to the Events Made Easy plugin, based on the old Sync Facebook Events plugin. 
Uses the Facebook PHP API, which requires at least PHP 5.4 to work. 
Note: This plugin is NOT owned or maintained by Facebook in any way.
Get The Events Made Easy plugin: 
https://wordpress.org/extend/plugins/events-made-easy/

EME Sync Events

A simple plugin to sync Facebook events to the Events Made Easy plugin (not owned or maintained by Facebook in any way).

ablancodev

Synchronizes wordpress users with MailChimp. Select MailChimp list, group and subgroup (subscribers organized in a subgroup or according to your role), and automatically new users are added to this mailchimp group. 
Add, update and delete synchronized users.
Official site: <a href="http://eggemplo.com/plugins/users2mailchimp/" rel="nofollow ugc">eggemplo</a>

Users2MailChimp

Synchronizes wordpress users with MailChimp email marketing service.

EME Sync Events vs Users2MailChimp