The interaction between Muslim men and women in the community basically need to be separated as necessary as possible. Mixing situation may be unavoidable in the market. However in schools, workplace, and even in wedding ceremony it is possible. This is to prevent indecent interaction such as touching opposite sex consciously or unconsciously. This is an example of Islamic sharia (law) that protect and honour women.
Actually, any culture understand this separation as in the separation of restrooms. Nowadays there are even more separation in public place like train specifically dedicated for women.
If you want to know more about the wedding news click here