ANSWER:

If this is mixed and there would be non mahram men, you must not attend even while wearing your abayah. 

My sister’s marriage has been fixed,You must be aware of the marriage party in sub continent ,There is a complete mixing up of women and men ,and women in subcontient on any function put off their outer garment (jilbaab,abhayas)and wear kameez shalwar which are very attractive and having glitters over it and are decorated with embroidery My family is forcing me to putt off