Two in my area of NE PA.
Montrose, PA. Susquehanna County Seat, <100 folks with many cars license plates being from NY not PA.
Honesdale, PA. Wayne County Seat. Similar here as in Montrose. Many of the folks were not locals.
Binghamton, NY. The closest major city to my AO, it was estimated by the local news that "hundreds" of protesters showed up. I had breakfast with a retired BPD LEO, and he told me that looking at an elevated level of folks on the local news, it was maybe 300 protesters and you couldn't tell if it was just curious onlookers or protesters.
I am sure in major Blue cities, there were a lot of folks that showed up, however out here in flyover country, not much interest. ✌
I just did a quick scan through the interwize and there are no guest-o-mates on attendees for larger Blue cities. If it was a large number there would have been more reporting on it.