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The sentence in question:
取材で訪れたとある街で「きょうのラジオで近藤麻理恵が出ていたよね。最近“こんまり”している？」という会話が聞こえてきました。

For full context:
https://www3.nhk.or.jp/news/html/20190314/k10011847731000.html?utm_int=news_contents_tokushu_004

My attempt at translation:
"In a certain city, a conversation became audible (saying): 'Marie Kondo has vanished from nowadays radio, hasn't it? Recently, one makes/pronounces it 'Konmarie'?'...."

Now as you can see, I didn't translate 取材で訪れた at all here. That's because I just have no idea how to do it xD

"In a news article appeared" is how I would translate the phrase in isolation.
However, I'm already confused WHERE to connect it to, or how.
Making it a "direct" attribute to とある街 didn't make sense in my attempts to form a comprehensible sentence. If I just "added" it to とある町　it would kind of work up to a certain point:

"In a news article appeared in a certain town a conversation (saying): '...'" but it goes terribly wrong once it collides with 聞こえてきました since no conversation can become "audible" in a news article. At least I understood it as a news article without any audio/audio-video content but just in plain written language.

Making it a relative attribute feels wrong to me:
"In a news article, which appeared in a certain town...". I can only think of this as being grammatical if the whole 取材で訪れたとある街で can be regarded as some sort of adverbial which is only loosely attached to the '[quote]という会話' phrase. But even there I wonder if this can be correct, because it basically leaves us with the same problem as in the first attempt 'In a news article...the conversation became audible' which simply doesnt make much sense to me.
Furthermore, I wonder if it is grammatical to do:
取材で[relative attribute]
???
Because, well, I assume that 取材で is kind of an adverbial itself, isn't it? And having an adverbial like this being modified by a relative attribute...I don't know, as you can see I'm thoroughly confused and utterly clueless on this and request your help :D

取材で訪れる means "visit ~~ to collect data / gather material / for coverage / for an interview".

So 取材で訪れたとある街 means "a town that I visited to gather material" (取材で訪れた is a relative clause modifying とある街).

［取材で訪れた］とある街 -- a town [that I visited to gather material]

cf.

［仕事で訪れた］街 -- a town [that I visited on business]

［休暇で訪れた］街 -- a town [that I visited for vacation]

会話が聞こえてきました here means "I overheard a conversation".

「きょうのラジオで近藤麻理恵が出ていたよね。最近“こんまり”している？」

"Marie Kondo was on the radio today. Have you been KonMari-ing recently?"