Surprises are generally a part of the event industry.  Things like your conference materials have not been delivered, or your volunteers didn't show up, or the speaker's presentation is crashing, are all examples of bad surprises.  These "mini-crises" can cause some stress for an event manager.  Sometimes no matter how hard you plan the unexpected happens.  In these moments of crisis: DO NOT PANIC!  Whether you realize it or not, you set the tone for how people around you react.  Instead, make a plan and spring into action.  I have a motto that I like to use: