INDP is mainly coded using written responses about the business name and address of a person's employer (questions 40 and 41 on the Census Household Form) and on the type of industry and main goods or services produced by the business or their employer (questions 42 and 43 on the Census Household Form).
There are many people who visit Las Vegas during the winter months between December and February - the city can be very crowded and room rates are high. Spring from March to May and fall between September and November are the best times to visit Las Vegas.
At this point, weather.com is predicting a high of 113F/45C in Death Valley and 104F/40C in Las Vegas on July 19-20, with a low chance of thunderstorms in LV just before the weekend. Ugh. I'd skip both, but I suppose the stop after Las Vegas is the Grand Canyon. FWIW, in that area, desert is desert.