I was just trying to do something similar for when my sisters arrive and I came across www.ladiesnightdubai.com
You can search by area of Dubai or a specific night of the week. :)
Ive been set a challenge - to coordinate a girls night out on Weds in Dubai Marina/JBR - without it costing anything. Does anyone know where there may be Ladies Nights on Weds night in the area. TIA :)