…In a conference organisers purse.
Flashlight – you can guarantee that light switches and IT connector panels are hidden in totally inaccessible places. Parking lots are also scary places when you are the last one to leave at night
Screwdriver/multi tool – the above normally need some kind of connector reconnecting or dodgy wire reattaching.
Hammer – useful for a number of reasons, this session it has been mostly used for breaking up bags of ice (I’m organiser, caterer and cleaner on this event). It has other uses. I’m not saying anymore ;)
A smile – obligatory at all times- sometimes needs faking.