That's ok to have a ladies only day so hijabis and nikabis could have their fun too sans hijab.Not just Muslimas but as mentioned by Xena even some non Muslim ladies, prefer "ladies only" days as well for both religious and non religious reasons. However to expect everyday to be "men only" or "women only" is rather far fetched given that today even public beaches have women in bikinis, gender mixing,etc not to mention the malls and what goes on in them very openly. and not quite what the organizers had in mind obviously. So like I said its left to be seen now. Can one have their cake and eat it two..and for those who invested in this project, I wish them all the best! I'm sure they were not naive when they decided on opening such a venue, they may have very well expected all this..and may also very well already have a plan, Inshallah!