Past Every Light, Darkness

Horizon has a blog post discussing an incident of date rape drugs at BronyCon.

I was not present for this event. I did not get harassed myself in my limited time there, thankfully, but it can happen to anyone. Even when attending something as fun and friendly as a convention for MLP fans, keep your wits about you, and try to always go places with a friend (especially if it's out drinking.)

This isn't to say that you need to be afraid at these places, but the nature of our reality is one where absolute, blind trust is not safe. You can be safe and have fun with sensible precaution and prevention.