How to manually refresh several datasets at once

I'm evaluating Power BI for my company. I run a data warehouse that has 70 workbooks that have been published and need to be refreshed every month. 

1. I have to refresh all 70 at one time as, say, "The November data".
2. I can't do this on a schedule because sometimes some of the data is late; sometimes it's early and managers want it ASAP.
3. But I don't want to sit there and manually launch 70 refreshes. I need a way to refresh them all as a single manually-launched batch job.

How?

Thanks - Steve