When do my custom (non-monthly) invoices go out?

You can see the date(s) custom invoices are scheduled to go out on the “Programs” page.

Click “Programs” on the left sidebar, find a custom program, then click where it says “Show Info.” This will show you the days the invoices are scheduled to be sent, due, and late. If you want to send an invoice prior to the send date, click "Edit" on the invoice, then click “Save and Send” to send the invoice out to the parents immediately.  

Here is a walkthrough of locating your custom program settings:
CUSTOM PROGRAM SETTINGS