When I work with organizations that use Mailchimp (or any other non-synced email platform), Google Forms, etc, it's very common to end up with multiple contact lists that need to be combined, cleaned, and imported or otherwise used for mission-related work. Here's a quick strategy of how to make beautiful, deduplicated contact lists from two, three, or more sources! https://thedataarealright.blog/2021/09/23/how-to-combine-three-contact-lists/
