Hi Azra,
Instead of Madhapur Exhibition you can call it as "Shilparamam exhibition"!!
Yeah what you heard from your friend is true, especially exhibition will be during Sankranti time or ending of December to mid of January every year and this come only once in a year.
You can find all interirors like hangings, paintings, glassware, indoor items, clothing, textiles, fancy and what not..?? By the way this place itself is a big exhibition for me when ever i visit

this place rocks..
In Hyderabad you can visit two big exhibitions in a year, one is Nampally exhibition and other is Shilparamam, where first one is commercial second one is homely