Saw a video the other day on youtube, a GA pilot got low-approaches to the NYC 3 (EWR, LGA, JFK) on one flight, in succession. He commented in his planning that he thought he'd at least ask because he thought it might be doable as United is operating 9 flights a day out of EWR which is their 3rd largest hub and their primary for the east coast and flights to Europe.
I also noticed a TFR a back in March over Chicago Midway. According to the news report I read on it, the Midway tower closed due to staffing cutbacks with COVID and local pilots took that as an opportunity to go out and do touch-n-gos at KMDW.
Now's the time to get your approaches and landings in at Class B airports if that's something of interest to you.