Does anyone here ever visit the Mystery Worshipper website? Here’s the link:
The volunteer “Mystery Worshippers” attend services (mostly in the UK and US) and post photos and respectful reports on the website. Most of the reports pertain to Protestant services, but there are a fair number of reports on masses, by knowledgeable Catholics. There is one person who has written several excellent reports on EF masses in various locations in the northeast US.