Arriving to Berlin in June - July - PLZ help !!!!

Hello to everyone,

I'll be visiting Berlin during June - July months (not sure of the dates yet)

It's my first time so I really need some recommendations about:
- annual events during those months (clubbing, music concerts)
- hip clubs with hipsters population
- trendy coffee houses and bars
- good places to meet creative and interesting people (I'm a fashion designer)
- nice and cheap hotel in the center of the action

Will be happy to receive any info - THANKS !!!!
Anastasia