Hussar
Legend
/snip
If the thing they're offended by isn't actually something against the convention's standards of behaviour, you've just avoided having to accuse an innocent person of doing something wrong. And if the report is something serious, you now know what level of sanction is appropriate. Hopefully, convention staff would treat a rape or death threat more seriously than someone complaining about a person making a joke about menstruation.
It happens. One article that cites examples: https://postmortemstudios.wordpress...-the-nicest-white-terrorists-youll-ever-meet/
Do you really think that if someone was threatened with rape, their complaint would be a simple "I feel harassed"? Would the person making the complaint likely not mention the rape threat? How likely is it that two people, making a harassment complaint, one where they overheard the word menstrual and the other after receiving a rape threat would make the same complaint?
OTOH, if someone comes to you and says, "Hey, those guys at the table are being really offensive, can you make them stop?" do you really need to find out more information? Do you really need to know what they said? And, if you do, why?