Unless you think event or building security won't help you, it's still probably better to go to them, even if a "real crime" has happened -- they're able to get police there faster than you can, to the right location, and may be able to assist themselves (a lot of building security are off-duty police, too, and at the very least they're good witnesses). Particularly if it's something which just happened or is ongoing.
I might call the police directly if it's something I want kept private (like, rape) which had happened already, but realistically anything which happens at a conference to an attendee will become known to the conference and venue security soon enough. Or I'd call the police if I didn't trust local security to do anything, like is sometimes the case with campus police. However, at conferences, I think most security staff would be responsive.
I might call the police directly if it's something I want kept private (like, rape) which had happened already, but realistically anything which happens at a conference to an attendee will become known to the conference and venue security soon enough. Or I'd call the police if I didn't trust local security to do anything, like is sometimes the case with campus police. However, at conferences, I think most security staff would be responsive.