Considering he- or rather the angel version of him- didn't have too much personal trouble with the Summer Fae of Portland and that he's been here before, Joker has no issue with wandering through the city. There are familiar faces here, after all, although all of them are arguably familiar considering.... you know.

So he's simply passing by when he hears the sound of Julian's guitar.... and, more importantly, the sound of his voice as he talks to a few of the fae around. He pauses for a second before venturing a little closer. He doesn't say anything, not right now- what is he even supposed to say? 'Hey so we were both weird angels, how about that'? Instead, he just stays quiet, listening.