Street Festival

There are several festivals along the streets where I currently live every year. From my perspective, they are inconvenient--strangers congregating on the sidewalks, loud music until late, traffic disrupted, stands and crowds hindering navigation. Yet street fairs provide color and options in a narrative. How can I use a street fair on Hypatia in the story? What could Star and Old Kelly see, do, imagine? How could it move the story along? I'll have to think about this because I know a little about these and the only saying is: write what you know. Perhaps it is simply a background for conversation. Has Star ever been to a street fair? Would something like this ever take place on a space station? I would think the answer is yes, but space is so limited. Where would such an event take place?