Well, Discover University just c ame out and is getting good reviews. Dine Out Game pack gives restaurants and allows you to run one and is really fun and there's also the Vampire Game Pack which gives the best Vampires of any iteration - that's the closest really to Nightlife. There's City Living but it's not so much like Nightlife gameplay so much as giving your Sims a lifestyle of living in the City with apartments, street art, festivials, markets and a few active careers like Politics and some others. A lot of the "Living" expansion packs are less fundamental gameplay changes that affect every Sim, and more about letting your Sim experience a certain way of life in a certain local. For being able to make a Business, you need Get To Work which also has Aliens, Baking, Photography skill, Active careers of Doctor, Detective and Scientist.