You need to find out if the club speakers are ACTIVE (amps built in) or PASSIVE (no amp). Active speakers have a power cord and power switch. If they are active speakers, you will connect the output of your mixer directly to the speakers. If they are passive, you will connect the output of your amp to the speakers.
If you can supply more detail like the make and model of your mixer, amp and the club's speakers, I can help more.
