Hey there Terry! I think you should be able to accomplish this using the events system. We have an after-hours/holiday autoresponder set up that emails the submitting user if it's outside of our business hours. The business hours and holiday dates are set at the Brand level, then you can set the Outside Business Hours = True flag in the event configuration. Let me know how that works out for you :)
Kyle Kerst
IT Coordinator
SmarterTools Inc.
www.smartertools.com