In Admissions Manager, we can create 'events' that parents can sign up for, but once they do, there's no easy way to email just these parents from inside isams, nor is there a way to create a 'custom group' and just select the parents/families who have signed up for just that event.
If you could add the 'event' lists to the chooser screen in 'custom group's, we could avoid having to manually type in the emails of each individual family into groups that we currently have to create manually and would save us a lot of time...
I'm not sure if this is what you're after, but once you've created an event in Admissions/Marketing, you can add families to it together via the pink drop-down in Applicants (add to previous event). Then, you can bring the list up via the Marketing search tab to send the group an email.