It's the Mertzes' 18th wedding anniversary, and Lucy (Lucille Ball) and Ethel (Vivian Vance) want to celebrate with a night at the Copacabana club. Unfortunately, hubbies Ricky (Desi Arnaz) and Fred (William Frawley) have their hearts set on attending the fights. The inevitable argument ensues, with Lucy and Ethel huffily telling the boys that they intend to go to the Copa with male escorts, whereupon Ricky and Fred respond that they will still attend the fights, with dates of their own. As things turn out, Ricky and Fred end up dating Lucy and Ethel, who are "disguised" as a pair of hillbillies. Desi Arnaz sings "Guadalajara" in this, the first I Love Lucy episode to be telecast (but not the first one filmed).