How to calculate Audio System conducts??

Its too vague to help you any more.

You should tell us, how big is the hall? how much sound will you like to get?

what color and lux o f light will you like? and special effect of the light...

hehe I hvnt entered the Disco, but I think I can help you to design a little.

None will consider your hall's acoustic, you can only select audio power and plan. not trouble.

calculate the conductors of the plant or system

What system? Amps? compressors? array or what speaker configurations, and manufacturer?

Show a blue print of hall, any over hangs or wings, give detailed dimensions and placements of articles i.e. stage, dance floor, lighting, tables, bar etc.. Wall, ceiling and floor materials and or coverings.