Would it be possible to organize a cinema with a big screen, sound and no electricity around. And your equipment would fit in one pocket 
Yes. It’s very possible!
What you need is a mini projector, white wall or whiteboard (this one will not fit in your pocket), iPhone and a mini sound system powered by battery pack:
If you have all those gadgets, then you’re ready to invite your friends for cinema in open air:
SIV’2010 video material of Lithuanian paragliding pilots was more interesting than any football or F1!
Wanna build your own open-air cinema hall, then you will need:
Mini-projector: Cinemin Swivel Multimedia Pico Projector
External battery pack: 6400mAh External Battery Pack
Mini sound tower: Pleomax USB speaker
All those gadgets give you fun no matter where you are, and how far from power supply you’re. ~5 hours of fun without charging is guaranted.
Also you have a mobility with those toys in case of rain or fire