I knew that would happen....I just sent in my order and here comes one more!

You're not the first chairperson that has had that problem! If you only have one late order...congratulations!
The best way to deal with that is to send me a scan of the late order in an email with your group number included and I'll make sure that it gets where it belongs for processing.
Your late order may be invoiced separately and be charged shipping....and will not necessarily deliver with your main order.....but you will get it!