Newsletter blog post aggregation

Hello
Interesting question for you which I hope you will be able to help me with:

The site that I'm running (karibunyumbani.org) supports an orphanage in africa.
They have lots of news to share and like to post frequently, but often, they have no internet in their location and have to wait until they are able to get to an internet cafe in the main town before they can get online.
This means that, they might not post anything for a couple of weeks and then maybe 6 or 8 posts appear within a couple of hours.
I want to integrate with mailchimp to send blog posts to a distribution list, but am afraid that 8 emails arriving one after the other throughout the afternoon will be very unpopular!
Is there a way of taking everything posted, say for a week or a month and sending it all to mailchimp in one go, so that we can send it out as a kind of newsletter with a number of posts, rather than as a series of individual emails?
Let me know if you can think of anything which might help
Best Wishes
Liz