Ministry of Sound is the name of the club.
The Gallery is the theme of the night every friday
which literally means it caters for trance fans and DJs. 95% of the time.
As saturday for the house music fans with different theme nights like defected in the house or toolroom knights just to give an example
The Gallery is the promotion. Ministry of Sound is the club where it's held
The Gallery is a trance night started at the legendary Turnmills (Turnmills - Wikipedia, the free encyclopedia) and its promoters are totally separate from the MoS.
wow thank you so much for your answers, you all got me out of the doubt