Targeted location question

I have a dilemma that I haven't encountered before. The company creates trade show booths for companies, but the kicker is that they only want to attract people exhibiting at Las Vegas locations. Usually, I would just set the targeted location to Las Vegas and call it a day, but in this instance, the people searching could be anywhere in the US and exhibiting in Vegas.

Right now, I have the keywords all set up with Las Vegas in each of them and the targeted location set to the United States, but is that the right way? If I changed the targeted location to Las Vegas and removed the city from the keywords, would I still get the same results since the people were likely looking at other Las Vegas sites beforehand?

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