In prisons, the bridal shower occurs for the purpose of deciding who's to be the bride and who's to be the groom. Soap may or may not be involved. Read what Missy Manners on proper etiquette re: attire, seating, gifts, etc.
“...for the purpose of deciding who’s to be the bride and who’s to be the groom...”
Thank goodness. That answers my question about who carries who over the threshold.