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?
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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.