How to combine "calculate" and "hidden" scripts for result from dynamic dropdown

Ok, So first, there is an order to how the different events are called on a field. The Validation script is only called when the field it is on has changed. So the Validation event for the Total field will not change when either of the dropdowns change, unless it causes a change in field value.  Take a look at this article. It is not on validation, but shows the event ordering for a single field, based on different actions.

https://www.pdfscripting.com/members/Formatting-Form-Fields.cfm#EvtSequ

The dropdown script shown in the show/hide article needs to be modified to fit the parameters on your form. It will not work as written in the article, this is just an example of how it can be done. However, in your case the field visibility depends on two dropdowns, so there is a better way to approach this. 

But first, how do you hide/show the other fields? Are all of these fields controled through validation scripts? This only works if there are unique changes made to each field, which is not reliable. 

Here is the better way. Use a calculation script in a hidden field that is on this form for the sole purpose of housing the calculation script. Calculations are called any time any field anywhere on the form is changed. This script will set the visibility for all of the fields. This method places all control in a single central location, making it more robust, more free of human error, and easier to maintain than distributing the code to several events that may or may not fire when needed.   

Here's the script outline:

// First, only run this script if the calculation was triggered by one of the dropdowns
if((event.source.name == "lodginglocationdropdown13") ||(event.source.name == "lodgingdropdown14"))
{
   // Next , find the display value for all fields
   var nDisplay = (this.getField("lodginglocationdropdown13").value == "CONUS" && 
   this.getField("lodgingdropdown14").value == "Hotel")?display.visible:display.hidden; 

   // Now set the display value for all fields
   this.getField("Total").display = nDisplay;
    ... set other fields ...
}