I'll take one from myself. I felt the effects as well.
No one is hurt, as far as I can tell. At most, people seem disgruntled. I seriously doubt this was some sort of criminal attack made with malice, if there were drugs in the drinks. This seems more like a bad joke or someone's poor idea of a good time than a dangerous criminal act. I didn't like it, but I don't know if it merits a full investigation.