All female guests are welcome to stay the night in Lewis if the following form is filled out and submitted to the rector at least 24 hours prior to her stay. Unfortunately, only female guests are welcome to stay the night in Lewis in order to promote the spirit of community established by parietals.
Officially, according to du Lac: A Guide to Student Life -
"In the residence halls, Notre Dame students are expected to register overnight guests with the Rector. Students are also expected to obtain prior permission from the Rector before admitting any visitor under the age of 18 to a residence hall. On home football weekends, and any other weekend that may be suggested by the Office of Residential Life, residence hall staff may request that guests provide identification before entering a residence hall."