Marketing Emails and Texts based on source and source detail fields

In Zivvy, lead management can be cumbersome. I would like to send an email to guests who attended a birthday party this weekend. I cannot create a list on source and source detail fields to do a mass email or text to these fields. So I have to create tags which is not easy to manage.
Feature Request: Ability to perform Marketing Emails and Texts based on source and source detail fields.