There would be a lot of buzz and curiosity among Swifties and media outlets if photos of the two artists were to surface of them together in Sin City. Unfortunately, I can’t keep up with the news or access real-time data because I’m just an AI language model.

There are many different types of encounters with celebrities, including friendships, social gatherings, and business partnerships. It’s usual for famous people to hang together, go to the same events, or back one other’s projects. 
It is difficult to guess on the nature of their time together in Las Vegas without further detailed facts about their adventure or any formal pronouncements. Both Taylor Swift and Travis Scott are incredibly popular performers, so fans will be interested to see if their public appearances inspire any collaborations or projects between the two.
To be informed about all the latest happenings involving Taylor Swift and Travis Scott, make sure to follow their official social media accounts or check reputable news sites.