The bachelor party goes into full force as Paddy gets ready to be social again, finally removing his wedding ring.
This transformation—made possible by a combination of shrewd entrepreneurship, access to water, an extensive transportation network, and permissive state laws—has created the city now often known simply as “Vegas,” a place of vast casinos, elaborate hotels, and spectacular entertainment venues that attracts masses of visitors from throughout the world. When Diana arrives, Billy pushes Paddy into the decorative pool in the suite, and takes Diana upstairs to tell her that Paddy likes her and to give him a chance. Downtown Las Vegas is built to serve not residents but guests—tens of millions annually. Both blocks are now thought of as the origin of the nickname Sin City. These mob bosses founded The Flamingo, which was among the first resort casinos on The Strip. The next day, while the others are hungover and recovering, Paddy visits Diana and tells her that he and Billy were both in love with Sophie when they were younger and she picked Paddy.
But where, exactly, did the "Sin City" nickname come from? https://www.britannica.com/place/Las-Vegas-Nevada, Official Tourism Site of Las Vegas, Nevada, United States, Las Vegas - Student Encyclopedia (Ages 11 and up).  Audiences surveyed by CinemaScore gave the film a grade A-, on a scale from A to F., Scott Foundas of Variety wrote: "A smattering of funny gags and the nostalgia value of the cast — none of whom, curiously, have ever shared the screen before — keeps the whole thing more watchable than it has any right to be." Contributing Editor, Encyclopædia Britannica; Literary Critic. Billy is a successful entrepreneur in Malibu, California, who lives with his 31-year-old girlfriend Lisa. The resort casinos, nightclubs, and, more recently, day clubs, haven’t done anything to kill the reputation most associate with Las Vegas as Sin City. There are obvious reasons for that name—gambling is legal here, unlike most other major U.S. cities, and there’s more than a few adult entertainment venues. In fact, they often live in the suburbs even if they do work in casinos, shows, or clubs. While Las Vegas, as a whole, is the place known as "Sin City," the locus of the city's original red light district was Blocks 16 and 17. The vaccine consent form and insurance information is required before the shot will be administered. Paddy tells Billy he invited Diana to the party because he likes her and wants to start anew after Sophie's passing, but realizes Billy likes her too. Ignatiy Vishnevetsky of The A.V. But plenty of Las Vegans work outside these industries; after the recession, Las Vegas saw the need to diversify its economy into other fields. The sites consensus states: "The cast of Last Vegas keep things amiably watchable, but the film is mostly a mellower Hangover retread for the older set.