Pretty much. Be aware, though, that frequently the Sim that is going to fill the vendor role might be just hanging out in the Cantina when your Sim gets there. If you start talking to them right away, it will keep them from going to be a vendor. I've also found it's good to get to the Cantina at around 9AM and a vendor usually shows up pretty soon after I get there. Afternoons seem to take the longest, at least in my game.