The reception, planned for March 15, will raise funds for her campaign. Democrats Sen. Kirsten Gillibrand of New York, Rep. Adam Smith of Washington and Rep. Debbie Wasserman Schultz of Florida are co-chairs of the fundraiser.
Organizers say they're so proud of Giffords as she continues her incredible recovery.
The Arizona congresswoman was shot in the head in Tucson during a massacre last month that left six people dead.
After two weeks in intensive care, she was moved to Houston, where her family and staff have reported in recent days that she can walk the halls of the hospital holding onto a cart and can mouth the words to simple songs.
The Associated Press contributed to this story.