Let’s say you’re a wedding planner, and you want to offer a series of email tips called "Countdown to your wedding." Keep in mind I eloped, so I know absolutely nothing about weddings. This is just theoretical here.
You can do that with MailChimp’s Autoresponders.
Just build your signup form with a date field like this:
Then, build a series of autoresponders that build up to that due date like this:
Notice that in my signup form, there was a checkbox for "send me free planning tips."
So when you build the actual autoresponder email, you can target only subscribers who asked for the free tips:
You can actually do this for any big future event, like baby due date, "when you plan to purchase" dates, and even annually recurring dates like birthdays and anniversaries.