Since Bath is such a tourist heavy area and there are so many events, tours and just general places to see, there’s a good chance that there are people running scams. Usually by trying to trick people with fake or out of date tickets and surprisingly cheap deals. The best way to avoid this is pre-planning: book tickets online from the official website of the event and be aware of normal pricing (as I’m sure everyone’s mother has told them: if a deal sounds too good to be true- it probably is). The advantage a scammer has over you is that you don’t know any better so read up on events before you go and only buy from official sources.