A common tradition that I have observed is for a kallah to have a "Shabbos Kallah" on the shabbos before her wedding. What exactly is a shabbos kallah and why do people have them?
During the week before the wedding the Chasson and Kallah do not see each other, so she can't go to the Aufruf.
Instead they hold a Shabbos Kallah for her. There is no source that I could find that requires this, it's just something people do to make the Kallah happy.
Note that this is an Ashkenazi custom, Sefardim don't have an Aufruf or a Shabbos Kallah.