Is there a way to create dependencies between boards.

[John Caldwell]

I have 20 or so projects that need to be completed in order. when an emergency comes up and moves ahead of everyone I need the projects behind it go adjust their due dates automatically. 

[Torben_trello]

Right now, dependencies aren't possible natively within Trello. 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.

In the meantime, you can link cards to each other or use the Hello Epics Power-Up to define informal relationships between cards: https://info.trello.com/power-ups/hello-epics

I hope that helps.