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At the moment, it is not possible to automate email reminders in this way, but we have a couple of work-around suggestions:
Option 1: Tasks:
If you set the Channel (or anything else) as a Task, they'll automatically get reminders at intervals before it's due, and when it's overdue.
To see more details about this feature, and an exact description of the notifications that are sent out, please read this article.
Option 2: Notification send-out:
You can send a notification message to selected people. (This will have to be done manually, can't be set automatically.)
To do this, go to either the Individuals page or the Task Log and select the people you want to message using Batch actions.
Then, you can enter your message and then 'blast notify'.
Please see the images below for a guide...
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