Thanks for reaching out!
Stephen is correct here. At the moment, there isn't a way to add more than one Due date on a card - you'll need to create multiple cards and add the same Due date to each.
That said, I’ll pass your interest in this on to our team for consideration—let me know if there's any additional info you'd like for me to send their way!
If you'd like to see our latest features and releases you can take a look at our dev board at http://www.trello.com/dev. Our mobile boards are available at https://trello.com/b/5tj4qAvo/trello-ios-app and https://trello.com/b/ud59t1fL/trello-android-app.
The Trello Team
Hello Community! My name is Brittany Joiner and I am a Trello enthusiast and Atlassian Community Leader. I'll be sharing with you a series of videos with my top tips on how to best use Trello...
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