Are you talking about the covert event board audits in hotels? I've done them since fall 2022 . The MSP is Bestmark. I don't know how many of them currently are available, though, as they assign the visits to specific auditors week-after-week who agree to perform the audits consistently. You can certainly hop onto their site and see if there are any visits available. They post these visits every Thursday, if any are available, for the next week.
If you do some thought and planning, it is fairly easy to avoid all hotel staff entirely. Plan your entry/exit in such a way as to avoid the front desk, and you're usually home free.
In the 2+ years that I have done these audits I have had 2 serious confrontations. In both cases I was approached and asked what I was doing. I told them that I was doing a project gathering event data. In 1 case I was kicked out of the facility by the onsite security and told never to come back. In the other case it was security which was specific to the event and not general onsite security that kicked me out, so I was able to return after the event had concluded (and I continue to visit that facility currently).
I've had a couple of other interactions that were not at all confrontational. The staff that approached me were fine with me doing what I was doing. Some other interactions have been humorous because what they think/thought about the nature of my visits isn't correct.
If you're hesitant about doing these audits because of potential confrontations, then don't be hesitant. You can reduce to a minimum being seen by hotel staff with proper planning, and in most cases the staff doesn't really care. I am forced to pass by the front desk at one of my assigned hotels. I have walked by the front desk on entry/exit 3x per week for 2 years and the front desk staff has said a total of 3 words to me. On 3 occasions someone said "hi" and have said nothing to me the other 300 times.