What do you need weary cosplayer? I have:

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• Band-Aids 
• Water
• A cell phone that calls ambulances
• Directions for the geographically challenged
• I'm not a Doctor, The Doctor, a Medical Professional, nor anything like that, but I can call for help if you ask

• Binder clips
• Split key rings
• Thread
• Needles
• Super glue
• Plastic buckles
• Scissors
• Safety pins

I am the plug. I will have charged power banks you may siphon from

• Wall blocks 
• Micro USB 
• USB type c 
• Apple lightning
• Screaming Batteries (AA, AAA)
• Batteries 9 Volt 
• Batteries random
• Cables random