Star Wars: Rogue One - 11 Biggest Unanswered Questions
6. Why Were The Cantina Douchebags On Jedha?
The Question: On Jedha, Jyn and Cassian briefly pass by Dr. Evazan and Ponda Baba, the douchebags from the Mos Eisley Cantina in A New Hope. But before heading to Tatooine, what the Hell were they doing on Jedha?
The Likely Answer: Again, this is driven more by fan service than anything else, though considering that Evazan is wanted in twelve star systems, it's fairly plausible he'd be doing a lot of planet hopping, even if it's highly coincidental that the pair cross paths with highly important characters from the Star Wars realm multiple times.
Maybe they were there for some sightseeing...or something?